Clean up formatting in serial-console-overview.md

Removed empty lines from the list of Azure regions.

Author: mbifeld

support/azure/virtual-machines/windows/serial-console-overview.md

@@ -33,9 +33,7 @@ Serial Console is available for virtual machines and virtual machine scale sets
 - Australia East
 - Australia Southeast
 - Austria East
-
 - Belgium Central
-
 - Brazil South
 - Brazil Southeast
 - Canada Central
@@ -44,7 +42,6 @@ Serial Console is available for virtual machines and virtual machine scale sets
 - Central US
 - Central US EUAP
 - Chile Central
-
 - China East 2
 - China East 3
 - China North 2
@@ -57,17 +54,14 @@ Serial Console is available for virtual machines and virtual machine scale sets
 - Germany North
 - Germany West Central
 - Indonesia Central
-
 - Israel Central
 - Israel Northwest
-
 - Italy North
 - Japan East
 - Japan West
 - Korea Central
 - Korea South
 - Malaysia West
-
 - Mexico Central
 - New Zealand North
 - North Central US