Adjusting community links based on official wording

Author: VesaJuvonen

docs/toc.yml

@@ -1636,9 +1636,9 @@
     href: https://aka.ms/spdev-issues
   - name: Submit feature requests
     href: http://aka.ms/spdev-uservoice
-  - name: Developer PnP on YouTube
+  - name: SharePoint Developer Videos on YouTube
     href: http://aka.ms/spdev-videos
-  - name: Developer PnP on Twitter
+  - name: Office Development on Twitter
     href: https://twitter.com/officedev
   - name: SharePoint developer forum
     href: http://aka.ms/spdev-community