Enhance HTTP header rewrite PowerShell documentation

- Improved technical accuracy and clarity in component descriptions
- Enhanced prerequisite sections with specific version requirements
- Added comprehensive explanation of core components and their relationships
- Improved PowerShell code examples with better commenting
- Enhanced verification steps and troubleshooting guidance
- Updated warning and note blocks for better clarity
- Added more detailed next steps and resource links

Author: Vyshnavi-MSFT

articles/application-gateway/add-http-header-rewrite-rule-powershell.md

@@ -101,7 +101,7 @@ $reqRoutingRule = Get-AzApplicationGatewayRequestRoutingRule -Name rule1 -Applic
 
 ## Update the application gateway with the configuration for rewriting HTTP headers
 
-In this example, the rewrite set would be associated instantly against a basic routing rule. In a path based routing rule, the association wouldn't be enabled by default. The rewrite set can be enabled either via checking the paths on which it needs to be applied via portal or by providing a URL path map config specifying the RewriteRuleSet against each path option.  
+In this example, the rewrite set would be associated instantly against a basic routing rule. In a path based routing rule, the association wouldn't be enabled by default. The rewrite set can be enabled either via -- checking the paths on which it needs to be applied via portal or by providing a URL path map config specifying the RewriteRuleSet against each path option.  
 
 ```azurepowershell
 Add-AzApplicationGatewayRewriteRuleSet -ApplicationGateway $appgw -Name $rewriteRuleSet.Name  -RewriteRule $rewriteRuleSet.RewriteRules