Fix typo GuestCleanupJob in Bulk Enqueuing section

The job name throughout the tutorial is with plural "Guests" not "Guest" so we
make it consistent here. Also updates the variable names for consistency.

Author: cglwn

guides/source/active_job_basics.md

@@ -747,24 +747,24 @@ jobs as arguments (note that this is different from `perform_later`).
 `perform_all_later` does call `perform` under the hood. The arguments passed to
 `new` will be passed on to `perform` when it's eventually called.
 
-Here is an example calling `perform_all_later` with `GuestCleanupJob` instances:
+Here is an example calling `perform_all_later` with `GuestsCleanupJob` instances:
 
 ```ruby
 # Create jobs to pass to `perform_all_later`.
 # The arguments to `new` are passed on to `perform`
-guest_cleanup_jobs = Guest.all.map { |guest| GuestsCleanupJob.new(guest) }
+cleanup_jobs = Guest.all.map { |guest| GuestsCleanupJob.new(guest) }
 
-# Will enqueue a separate job for each instance of `GuestCleanupJob`
-ActiveJob.perform_all_later(guest_cleanup_jobs)
+# Will enqueue a separate job for each instance of `GuestsCleanupJob`
+ActiveJob.perform_all_later(cleanup_jobs)
 
 # Can also use `set` method to configure options before bulk enqueuing jobs.
-guest_cleanup_jobs = Guest.all.map { |guest| GuestsCleanupJob.new(guest).set(wait: 1.day) }
+cleanup_jobs = Guest.all.map { |guest| GuestsCleanupJob.new(guest).set(wait: 1.day) }
 
-ActiveJob.perform_all_later(guest_cleanup_jobs)
+ActiveJob.perform_all_later(cleanup_jobs)
 ```
 
 `perform_all_later` logs the number of jobs successfully enqueued, for example
-if `Guest.all.map` above resulted in 3 `guest_cleanup_jobs`, it would log
+if `Guest.all.map` above resulted in 3 `cleanup_jobs`, it would log
 `Enqueued 3 jobs to Async (3 GuestsCleanupJob)` (assuming all were enqueued).
 
 The return value of `perform_all_later` is `nil`. Note that this is different