docfix issue3378 (SharePoint#3413)

-fixes SharePoint#3378

Author: andrewconnell

docs/schema/declarativecontextdefinitiongroup-element-solutionmanifestdeclarativeextensions.md

@@ -115,7 +115,7 @@ The following sections describe attributes, child elements, and parent elements.
 </thead>
 <tbody>
 <tr class="odd">
-<td align="left"><p><a href="http://msdn.microsoft.com/library/8b647f38-f31c-747a-5637-339140cbcba3.aspx">ContextDefinition</a></p></td>
+<td align="left"><p><a href="https://docs.microsoft.com/en-us/sharepoint/dev/schema/declarativecontextdefinitiongroup-element-solutionmanifestdeclarativeextensions">ContextDefinition</a></p></td>
 <td align="left"><p>The **ContextDefinition** element is used to define a context for an external content type that is of this Outlook Item Type.</p></td>
 </tr>
 </tbody>