remove l_handle from bad example

Author: PhilippSalvisberg

docs/4-language-usage/8-patterns/4-ensure-single-execution-at-a-time-of-a-program-unit/g-8410.md

@@ -35,10 +35,9 @@ END lock_up;
 
 /* Call bad example */
 DECLARE
-   l_handle VARCHAR2(128 CHAR);
    co_lock_name CONSTANT VARCHAR2(30 CHAR) := 'APPLICATION_LOCK';
 BEGIN
-   l_handle := lock_up.request_lock(in_lock_name => co_lock_name);
+   lock_up.request_lock(in_lock_name => co_lock_name);
    -- processing
    lock_up.release_lock(in_lock_handle => l_handle);
 EXCEPTION