fix #67 - grammar in title, call in bad example

Author: PhilippSalvisberg

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

@@ -1,4 +1,4 @@
-# G-8410: Always use application locks to ensure a program unit only running once at a given time.
+# G-8410: Always use application locks to ensure a program unit is only running once at a given time.
 
 !!! tip "Minor"
     Efficiency, Reliability
@@ -39,11 +39,11 @@ DECLARE
 BEGIN
    lock_up.request_lock(in_lock_name => co_lock_name);
    -- processing
-   lock_up.release_lock(in_lock_handle => l_handle);
+   lock_up.release_lock(in_lock_name => co_lock_name);
 EXCEPTION
    WHEN OTHERS THEN
       -- log error
-      lock_up.release_lock(in_lock_handle => l_handle);
+      lock_up.release_lock(in_lock_name => co_lock_name);
       RAISE;
 END;
 /