Update troubleshooting.md

adding Note for gcc-high and DoD cloud EXO not being supported from Azure cloud Shell

Author: TonyD12ms

articles/cloud-shell/troubleshooting.md

@@ -209,3 +209,6 @@ PowerShell:
   ```
 ## Azure Government limitations
 Azure Cloud Shell in Azure Government is only accessible through the Azure portal.
+
+>[!Note]
+> Connecting to GCC-High or Government DoD Clouds for Exchange Online is currently not supported.