Update getstring.md

parameter format

Author: JimDaly

powerapps-docs/developer/component-framework/reference/resources/getstring.md

@@ -27,7 +27,7 @@ Model-driven apps, canvas apps, & portals.
 
 | Parameter Name|Type|Required|Description|
 | ------------- |----|--------|-----------|
-|id|`String`|Yes|Name of the resource in the component manifest.|
+|`id`|String|Yes|Name of the resource in the component manifest.|
 
 ## Return Value