Hi Sara,
You need to make some small fixes:

=== modified file 'CHANGELOG'

> --- CHANGELOG   2014-03-05 19:25:18 +0000
> +++ CHANGELOG   2014-03-09 03:03:28 +0000
> @@ -19,6 +19,7 @@
>      * Fix for bug #1286493 : GTG cannot connect to RTM, by Pawan Hegde
>      * Fix for bug #1288011 : More intuitive title label for tasks, by
> Sara Ribeiro
>      * Fix for bug #316922 : Have a link to the parent(s) in the task
> editor, by Parth Panchal
> +    * Fix for bug #1027604: Deeper integeration of userdoc, by Sara
> Ribeiro
>
>  2013-11-24 Getting Things GNOME! 0.3.1
>      * Fix for bug #1024473: Have 'Show Main Window' in notification area,
> by Antonio Roquentin
>
> === modified file 'GTG/gtk/backends_dialog.ui'
> --- GTG/gtk/backends_dialog.ui  2013-09-04 17:48:19 +0000
> +++ GTG/gtk/backends_dialog.ui  2014-03-09 03:03:28 +0000
> @@ -151,7 +151,7 @@
>                  <property name="can_focus">False</property>
>                  <property name="layout_style">edge</property>
>                  <child>
> -                  <object class="GtkButton" id="button1">
> +                  <object class="GtkButton" id="sync_help">
>                      <property name="label">gtk-help</property>
>                      <property name="visible">True</property>
>                      <property name="can_focus">True</property>
>
> === modified file 'GTG/gtk/backends_dialog/__init__.py'
> --- GTG/gtk/backends_dialog/__init__.py 2013-11-25 02:37:46 +0000
> +++ GTG/gtk/backends_dialog/__init__.py 2014-03-09 03:03:28 +0000
> @@ -72,6 +72,7 @@
>          self._load_widgets_from_builder(builder)
>          # Load and setup other widgets
>          self.dialog.set_title(_("Synchronization Services - %s" %
> info.NAME))
> +
>
Remove this extra line


>          self._create_widgets_for_add_panel()
>          self._create_widgets_for_conf_panel()
>          self._setup_signal_connections(builder)
> @@ -199,6 +200,13 @@
>          }
>          builder.connect_signals(signals)
>
> +        # adding F1 as a shortcut for Help
> +        agr = Gtk.AccelGroup()
> +        self.dialog.add_accel_group(agr)
> +        widget = builder.get_object("sync_help")
> +        key, modifier = Gtk.accelerator_parse('F1')
> +        widget.add_accelerator("activate", agr, key, modifier,
> Gtk.AccelFlags.VISIBLE)
> +
>      def _configure_icon_theme(self):
>          '''
>          Inform gtk on the location of the backends icons (which is in
>
> === modified file 'GTG/gtk/editor/editor.py'
> --- GTG/gtk/editor/editor.py    2014-03-05 19:25:18 +0000
> +++ GTG/gtk/editor/editor.py    2014-03-09 03:03:28 +0000
> @@ -24,10 +24,12 @@
>  The rest is the logic of the widget: date changing widgets, buttons, ...
>  """
>  import time
> +from webbrowser import open as openurl
>
>  from gi.repository import Gtk, Gdk, Pango
>
>  from GTG import _, ngettext
> +from GTG import info
>  from GTG.gtk.editor import GnomeConfig
>  from GTG.gtk.editor.taskview import TaskView
>  from GTG.core.plugins.engine import PluginEngine
> @@ -201,6 +203,10 @@
>          key, modifier = Gtk.accelerator_parse('<Control>w')
>          agr.connect(key, modifier, Gtk.AccelFlags.VISIBLE, self.close)
>
> +        # F1 shows help
> +        key, modifier = Gtk.accelerator_parse('F1')
> +        agr.connect(key, modifier, Gtk.AccelFlags.VISIBLE, self.show_help)
> +
>          # Ctrl-N creates a new task
>          key, modifier = Gtk.accelerator_parse('<Control>n')
>          agr.connect(key, modifier, Gtk.AccelFlags.VISIBLE, self.new_task)
> @@ -573,6 +579,12 @@
>              self.config.set(tid, "position", self.get_position())
>              self.config.set(tid, "size", self.window.get_size())
>
> +    # We define dummy variable for when show_help is called from a
> callback
> +    def show_help(self, window=None, a=None, b=None, c=None):
> +        """ Open help """
> +        openurl(info.HELP_URI)
> +        return True
> +
>      # We define dummy variable for when close is called from a callback
>      def close(self, window=None, a=None, b=None, c=None):
>
>
> === modified file 'GTG/gtk/plugins.py'
> --- GTG/gtk/plugins.py  2013-11-25 02:37:46 +0000
> +++ GTG/gtk/plugins.py  2014-03-09 03:03:28 +0000
> @@ -19,6 +19,8 @@
>
>  """ Dialog for loading plugins """
>
> +from webbrowser import open as openurl
> +
>
Remove this extra line

>  from gi.repository import Gtk, Pango
>
>  from GTG import _
> @@ -172,6 +174,14 @@
>                                  self.on_plugin_about_close,
>                                  })
>
> +        # adding F1 as a shortcut for Help
> +        agr = Gtk.AccelGroup()
> +        self.dialog.add_accel_group(agr)
> +        widget = builder.get_object("plugins_help")
> +        key, mod = Gtk.accelerator_parse("F1")
> +        widget.add_accelerator("activate", agr, key, mod,
> +                                       Gtk.AccelFlags.VISIBLE)
> +
>      def _init_plugin_tree(self):
>          """ Initialize the PluginTree Gtk.TreeView.
>
> @@ -237,7 +247,8 @@
>
>      @classmethod
>      def on_help(cls, widget):
> -        """ In future, this will open help for plugins """
> +        """ Open help for plugins """
> +        openurl("help:gtg/gtg-plugins")
>          return True
>
>      def on_plugin_toggle(self, widget, path):
>
> === modified file 'GTG/gtk/plugins.ui'
> --- GTG/gtk/plugins.ui  2013-09-04 17:48:19 +0000
> +++ GTG/gtk/plugins.ui  2014-03-09 03:03:28 +0000
> @@ -83,16 +83,16 @@
>            <object class="GtkButtonBox" id="dialog-action_area5">
>              <property name="visible">True</property>
>              <property name="can_focus">False</property>
> -            <property name="layout_style">end</property>
> +            <property name="layout_style">edge</property>
>              <child>
>                <object class="GtkButton" id="plugins_help">
>                  <property name="label">gtk-help</property>
>                  <property name="can_focus">True</property>
>                  <property name="receives_default">True</property>
> -                <property name="no_show_all">True</property>
> +                <property name="visible">True</property>
>                  <property name="use_action_appearance">False</property>
>                  <property name="use_stock">True</property>
> -                <signal name="released" handler="on_plugins_help"
> swapped="no"/>
> +                <signal name="clicked" handler="on_plugins_help"
> swapped="no"/>
>                </object>
>                <packing>
>                  <property name="expand">False</property>
>
> === modified file 'GTG/gtk/preferences.py'
> --- GTG/gtk/preferences.py      2014-01-14 16:36:35 +0000
> +++ GTG/gtk/preferences.py      2014-03-09 03:03:28 +0000
> @@ -21,6 +21,7 @@
>
>  import os
>  import shutil
> +from webbrowser import open as openurl
>
>  from gi.repository import Gtk
>  from xdg.BaseDirectory import xdg_config_home
> @@ -100,6 +101,12 @@
>              editor_font = font.to_string()
>          self.fontbutton.set_font_name(editor_font)
>
> +        # F1 shows help
> +        agr = Gtk.AccelGroup()
> +        self.dialog.add_accel_group(agr)
> +        key, modifier = Gtk.accelerator_parse('F1')
> +        agr.connect(key, modifier, Gtk.AccelFlags.VISIBLE, self.on_help)
> +
>
Remove this empty line

>          builder.connect_signals({
>                                  'on_pref_autostart_toggled':
>                                  self.on_autostart_toggled,
> @@ -148,8 +155,10 @@
>          return True
>
>      @classmethod
> -    def on_help(cls, widget):
> -        """ In future, this will open help for preferences """
> +    # We define dummy variable for when on_help is called from a callback
> +    def on_help(self, window=None, a=None, b=None, c=None):
> +        """ Open help for preferences """
> +        openurl(info.HELP_URI)
>          return True
>
>      @classmethod
>
>
> _______________________________________________
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> More help   : https://help.launchpad.net/ListHelp
>
> Also, Please run make lint=python3 and make sure that there are no errors
in the code that you have modified.