Add relevant link(s) to "See Also" section

Author: srutzky

docs/t-sql/functions/left-transact-sql.md

@@ -118,6 +118,12 @@ ab
 ```  
 
 ## See Also  
+ [LTRIM (Transact-SQL)](../../t-sql/functions/ltrim-transact-sql.md)  
+ [RIGHT (Transact-SQL)](../../t-sql/functions/right-transact-sql.md)  
+ [RTRIM (Transact-SQL)](../../t-sql/functions/rtrim-transact-sql.md)  
+ [STRING_SPLIT (Transact-SQL)](../../t-sql/functions/string-split-transact-sql.md)  
+ [SUBSTRING (Transact-SQL)](../../t-sql/functions/substring-transact-sql.md)  
+ [TRIM (Transact-SQL)](../../t-sql/functions/trim-transact-sql.md)  
  [CAST and CONVERT (Transact-SQL)](../../t-sql/functions/cast-and-convert-transact-sql.md)   
  [Data Types (Transact-SQL)](../../t-sql/data-types/data-types-transact-sql.md)   
  [String Functions (Transact-SQL)](../../t-sql/functions/string-functions-transact-sql.md)