Fix markdown formatting and update tag guidelines

Author: Stacyrch140

articles/azure-resource-manager/management/tag-mission-critical-workload.md

@@ -36,10 +36,10 @@ For further insights into defining a workload, refer to the following article.
 
 To enable use by Microsoft in a workload assessment, the tags used for mission critical workloads must use the following tag name and adhere to the value format.
 
-**Important:**
+[!Important]
 
-- Tag values must **NOT** contain numeric or non-English characters.
-- Tag values must conform to this RegEx pattern: ^[A-Za-z]+-[A-Za-z]+
+> Tag values must **NOT** contain numeric or non-English characters.
+> Tag values must conform to this RegEx pattern: ^[A-Za-z]+-[A-Za-z]+
 
   | **Tag Name** | **Value Type** | **Purpose** | **Value Format** |
   |---|---|---|---|