Apply suggestions from code review

Co-authored-by: Damien Caro <dcaro@microsoft.com>

Author: wangzelin007

.github/ISSUE_TEMPLATE/what_if.yml

@@ -6,7 +6,7 @@ body:
     id: intro
     attributes:
       value: |
-        Thank you for reporting a What-If feature issue! Please provide as much detail as possible.
+        Thank you for reporting an issue related to preview of changes (--what-if) or export to Bicep (--export-bicep) with az cli! Please provide as much detail as possible.
 
   - type: dropdown
     id: issue-type
@@ -33,7 +33,7 @@ body:
     id: command
     attributes:
       label: Command or Script
-      description: Provide the command or script that demonstrates the issue
+      description: Provide the command or script that helps reproducing or demonstrate the issue
       placeholder: |
         - az vm create --what-if --export-bicep
         - N/A if not applicable