Merge ~oddbloke/cloud-init/+git/cloud-init:doc into cloud-init:master

[Dan Watkins]

format.rst: add text/jinja2 to list of content types (+ cleanups)

The cleanups, specifically, are to sort the list of content types, and
remove trailing whitespace.

[Server Team CI bot (server-team-bot)]

PASSED: Continuous integration, rev:4c0febefdac03b08111efa81d6eebf0d199bc9d0
https://jenkins.ubuntu.com/server/job/cloud-init-ci/1057/
Executed test runs:
    SUCCESS: Checkout
    SUCCESS: Unit & Style Tests
    SUCCESS: Ubuntu LTS: Build
    SUCCESS: Ubuntu LTS: Integration
    IN_PROGRESS: Declarative: Post Actions

Click here to trigger a rebuild:
https://jenkins.ubuntu.com/server/job/cloud-init-ci/1057//rebuild

review: Approve (continuous-integration)

[Chad Smith (chad.smith)]

review: Approve

diff --git a/doc/rtd/topics/format.rst b/doc/rtd/topics/format.rst
index 15234d2..74d1fee 100644
--- a/doc/rtd/topics/format.rst
+++ b/doc/rtd/topics/format.rst
@@ -23,14 +23,15 @@ For example, both a user data script and a cloud-config type could be specified.
 
 Supported content-types:
 
-- text/x-include-once-url
-- text/x-include-url
-- text/cloud-config-archive
-- text/upstart-job
+- text/cloud-boothook
 - text/cloud-config
+- text/cloud-config-archive
+- text/jinja2
 - text/part-handler
+- text/upstart-job
+- text/x-include-once-url
+- text/x-include-url
 - text/x-shellscript
-- text/cloud-boothook
 
 Helper script to generate mime messages
 ---------------------------------------
@@ -38,16 +39,16 @@ Helper script to generate mime messages
 .. code-block:: python
 
    #!/usr/bin/python
-   
+
    import sys
-   
+
    from email.mime.multipart import MIMEMultipart
    from email.mime.text import MIMEText
-   
+
    if len(sys.argv) == 1:
        print("%s input-file:type ..." % (sys.argv[0]))
        sys.exit(1)
-   
+
    combined_message = MIMEMultipart()
    for i in sys.argv[1:]:
        (filename, format_type) = i.split(":", 1)
@@ -56,7 +57,7 @@ Helper script to generate mime messages
        sub_message = MIMEText(contents, format_type, sys.getdefaultencoding())
        sub_message.add_header('Content-Disposition', 'attachment; filename="%s"' % (filename))
        combined_message.attach(sub_message)
-   
+
    print(combined_message)
 
 
@@ -78,10 +79,10 @@ Example
 ::
 
   $ cat myscript.sh
-  
+
   #!/bin/sh
   echo "Hello World.  The time is now $(date -R)!" | tee /root/output.txt
-  
+
   $ euca-run-instances --key mykey --user-data-file myscript.sh ami-a07d95c9 
 
 Include File