Merge pull request #28477 from spdawson/patch-3

Remove stray back-end from ActiveJob Basics guide

guides/source/active_job_basics.md

@@ -114,7 +114,7 @@ For enqueuing and executing jobs in production you need to set up a queuing back
 that is to say you need to decide for a 3rd-party queuing library that Rails should use.
 Rails itself only provides an in-process queuing system, which only keeps the jobs in RAM.
 If the process crashes or the machine is reset, then all outstanding jobs are lost with the
-default async back-end. This may be fine for smaller apps or non-critical jobs, but most
+default async backend. This may be fine for smaller apps or non-critical jobs, but most
 production apps will need to pick a persistent backend.
 
 ### Backends