fix doc of exits method in resource collection (#54299)

Author: haiyuazhang

eng/packages/http-client-csharp-mgmt/generator/Azure.Generator.Management/src/Providers/OperationMethodProviders/ResourceOperationMethodProvider.cs

@@ -145,7 +145,7 @@ public static implicit operator MethodProvider(ResourceOperationMethodProvider r
             // Add enhanced XML documentation with structured tags
             ResourceHelpers.BuildEnhancedXmlDocs(
                 resourceOperationMethodProvider._serviceMethod,
-                resourceOperationMethodProvider._convenienceMethod.Signature.Description,
+                resourceOperationMethodProvider._description,
                 resourceOperationMethodProvider._enclosingType,
                 methodProvider.XmlDocs);