updated return value for clarity

based on PR 1840 https://github.com/MicrosoftDocs/sql-docs/pull/1840/files

Author: MashaMSFT

docs/t-sql/functions/error-procedure-transact-sql.md

@@ -43,7 +43,7 @@ ERROR_PROCEDURE ( )
 **nvarchar(128)**  
 
 ## Return Value  
-When called within a CATCH block in a stored procedure or trigger, `ERROR_PROCEDURE` returns the name of the stored procedure or trigger in which the error originated. 
+When called in a CATCH block, `ERROR_PROCEDURE` returns the name of the stored procedure or trigger in which the error originated.
 
 `ERROR_PROCEDURE` returns NULL if the error did not occur within a stored procedure or trigger.