Fix a header and "az login" section

Remove an unwanted character at the beginning of the header that breaks formatting.
Remove "az login" section. "az login" works now and it's not a limitation anymore.

Author: alexandair

articles/cloud-shell/troubleshooting.md

@@ -1,4 +1,4 @@
----
+---
 title: Azure Cloud Shell troubleshooting | Microsoft Docs
 description: Troubleshooting Azure Cloud Shell
 services: azure
@@ -41,11 +41,6 @@ Known resolutions for troubleshooting issues in Azure Cloud Shell include:
 
 ## Bash troubleshooting
 
-### Cannot run az login
-
-- **Details**: Running `az login` will not work as you are already authenticated under the account used to sign into Cloud Shell or Azure portal.
-- **Resolution**: Utilize your account used to sign in or sign out and reauthenticate with your intended Azure account.
-
 ### Cannot run the docker daemon
 
 - **Details**: Cloud Shell utilizes a container to host your shell environment, as a result running the daemon is disallowed.