Merge lp:~ya-bo-ng/resource-centre/replace-webinar-tutorials into lp:resource-centre

[Anthony Dillon]

## Done
Swapped Webinar to Tutorials in the mailing list sign up form.

## QA
- Go to http://insights.canonicalwebteam.com/
- Check there the mailing list sign up box on the right has Tutorials

[LukeWH (0-luke)]

review: Approve

=== modified file 'includes/_digest.php'
--- includes/_digest.php	2017-10-17 15:12:09 +0000
+++ includes/_digest.php	2017-10-23 09:58:28 +0000
@@ -28,8 +28,8 @@
             <label for="insightsiot">Internet of Things</label>
           </li>
           <li>
-            <input class="mktoLogicalField mktoCheckboxList mktoHasWidth" type="checkbox" id="insightswebinar" name="insightswebinar" value="yes" checked="checked" />
-            <label for="insightswebinar">Webinars</label>
+            <input class="mktoLogicalField mktoCheckboxList mktoHasWidth" type="checkbox" id="insights_tutorials" name="insights_tutorials" value="yes" checked="checked" />
+            <label for="insights_tutorials">Tutorials</label>
           </li>
         </ul>
       </li>