docs(general): Link scm preferences on scm page

Manual/contents/IDE_Tools/Source_Control.htm

@@ -28,6 +28,7 @@ <h1><span data-field="title" data-format="default">Source Control</span></h1>
     <li><a href="Source_Control/Cloning_A_Repository.htm">Cloning A Repository</a></li>
     <li><a href="Source_Control/Conflicts.htm">Conflicts</a></li>
     <li><a href="Source_Control/External_Merge_Diff_Tools.htm">Setting Up External Merge/Diff Tools</a></li>
+    <li><a data-xref="{title}" href="../Setting_Up_And_Version_Information/IDE_Preferences/Plugin_Preferences.htm">Plugin Preferences</a></li>
   </ul>
   <p> </p>
   <p><span data-keyref="GameMaker Name">GameMaker</span> will show a drop-down menu in the Menu Bar for Source Control, which will be populated with the following options once Source Control has been activated for your project (see the section <a href="Source_Control/Setting_Up_Git_Plugin.htm">Setting Up The Git Plugin</a> above for details):</p>