fix #66 - grammar

Author: PhilippSalvisberg

docs/4-language-usage/5-exception-handling/g-5030.md

@@ -9,7 +9,7 @@ This is error-prone because your local declaration overrides the global declarat
 
 ## Example (bad)
 
-Using the code below, we are not able to handle the no_data_found exception raised by the `SELECT` statement as we have overwritten that exception handler. In addition, our exception handler has not the exception number assigned, which is raise when the SELECT statement does not find any rows.
+Using the code below, we are not able to handle the no_data_found exception raised by the `SELECT` statement as we have overwritten that exception handler. In addition, our exception handler doesn't have an exception number assigned, which should be raised when the SELECT statement does not find any rows.
 
 ```
 DECLARE