quick grammar fixup in README.md

Just a few small tweaks... feel free to ask me to explain these changes if the reasons are not clear.  I'm happy to go into as much or as little depth as you'd like, either in comments on the PR or in a Zoom call or whatever else works best for you.

Author: brandondrew

README.md

@@ -288,7 +288,7 @@ Tasks are enqueued at their corresponding times by the dispatcher that owns them
 
 It's possible to run multiple dispatchers with the same `recurring_tasks` configuration. To avoid enqueuing duplicate tasks at the same time, an entry in a new `solid_queue_recurring_executions` table is created in the same transaction as the job is enqueued. This table has a unique index on `task_key` and `run_at`, ensuring only one entry per task per time will be created. This only works if you have `preserve_finished_jobs` set to `true` (the default), and the guarantee applies as long as you keep the jobs around.
 
-Finally, it's possible to configure jobs that aren't handled by Solid Queue. That's it, you can a have a job like this in your app:
+Finally, it's possible to configure jobs that aren't handled by Solid Queue. That is, you can have a job like this in your app:
 ```ruby
 class MyResqueJob < ApplicationJob
   self.queue_adapter = :resque