fixed typo in docs/HOOKS.md

Author: EugZol

docs/HOOKS.md

@@ -66,7 +66,7 @@ An unnamed hook (`before_perform`) will be executed first.
 
 The available hooks are:
 
-* `before _enqueue`: Called with the job args before a job is placed on the queue.
+* `before_enqueue`: Called with the job args before a job is placed on the queue.
   If the hook returns `false`, the job will not be placed on the queue.
 
 * `after_enqueue`: Called with the job args after a job is placed on the queue.