add language to code snippet

SimonCropp · web-flow · commit 5d50b0588b23 · 2018-08-09T14:19:05.000+10:00
diff --git a/docs/relational-databases/system-functions/changetable-transact-sql.md b/docs/relational-databases/system-functions/changetable-transact-sql.md
@@ -34,8 +34,7 @@ monikerRange: "=azuresqldb-current||>=sql-server-2016||=sqlallproducts-allversio
   
 ## Syntax  
   
-```  
-  
+```sql
 CHANGETABLE (  
     { CHANGES table , last_sync_version  
     | VERSION table , <primary_key_values> } )  
