Merge pull request #6943 from victren/patch-5

Update xml-transact-sql.md

Author: rothja

docs/t-sql/xml/xml-transact-sql.md

@@ -30,7 +30,7 @@ ms.date: "07/26/2017"
 ## Syntax  
 
 ```
-xml ( [ CONTENT | DOCUMENT ] xml_schema_collection )  
+xml [ ( [ CONTENT | DOCUMENT ] xml_schema_collection ) ]
 ```  
 
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