Fix spell life cycle on activejob docs [ ci skip]

activejob/lib/active_job/callbacks.rb

@@ -3,8 +3,8 @@
 module ActiveJob
   # = Active Job Callbacks
   #
-  # Active Job provides hooks during the lifecycle of a job. Callbacks allow you
-  # to trigger logic during the lifecycle of a job. Available callbacks are:
+  # Active Job provides hooks during the life cycle of a job. Callbacks allow you
+  # to trigger logic during the life cycle of a job. Available callbacks are:
   #
   # * <tt>before_enqueue</tt>
   # * <tt>around_enqueue</tt>

guides/source/active_job_basics.md

@@ -215,8 +215,8 @@ backends you need to specify the queues to listen to.
 Callbacks
 ---------
 
-Active Job provides hooks during the lifecycle of a job. Callbacks allow you to
-trigger logic during the lifecycle of a job.
+Active Job provides hooks during the life cycle of a job. Callbacks allow you to
+trigger logic during the life cycle of a job.
 
 ### Available callbacks