Update Set-AzDiagnosticSetting.md (#11636)

* Update Set-AzDiagnosticSetting.md

doc fix

* Update Set-AzDiagnosticSetting.md

Author: VeryEarly

src/Monitor/Monitor/help/Set-AzDiagnosticSetting.md

@@ -358,7 +358,7 @@ Accept wildcard characters: False
 ```
 
 ### -WorkspaceId
-The Id of the workspace
+The resource Id of the Log Analytics workspace to send logs/metrics to
 
 ```yaml
 Type: System.String