Added stackoverflow and SDK documentation link

Author: FlorianBorn71

articles/remote-rendering/reference/toc.yml

@@ -9,4 +9,6 @@
 - name: arrClient repository (GitHub)
   href: https://dev.azure.com/arrClient/arrClient/_git/arrClient
 - name: Azure Mixed Reality Resource Management REST API
-  href: https://docs.microsoft.com/rest/api/mixedreality/
+  href: https://docs.microsoft.com/rest/api/mixedreality/
+- name: C# API documentation
+  href: https://review.docs.microsoft.com/dotnet/api/Microsoft.Azure.RemoteRendering

articles/remote-rendering/resources/toc.yml

@@ -3,4 +3,6 @@
 - name: Troubleshoot
   href: troubleshoot.md
 - name: Provide product feedback
-  href: https://feedback.azure.com/forums/928696-azure-remote-rendering
+  href: https://feedback.azure.com/forums/928696-azure-remote-rendering
+- name: Stack Overflow
+  href: https://stackoverflow.com/questions/tagged/azure-remote-rendering