docs: fix typo in job retry section (#4885)

This fixes a small typo in the job retry section.

Co-authored-by: Niek Palm <npalm@users.noreply.github.com>

Author: pascal-hofmann

docs/index.md

@@ -79,7 +79,7 @@ The Instance Termination Watcher is creating log and optional metrics for termin
 
     This feature is Beta, changes will not trigger a major release as long in beta.
 
-The Job Retry will allow you to retry scaling when a job is not started. When enabled the scale up lambda will send a retry message to the a SQS queue. The Job Retry lambda will check after a delay if the job is still queued, and if so, it will send a retry command to the scale up lambda via SQS. The feature is designed to be used with ephemeral runners. The feature is opt in, it will not be created by default.
+The Job Retry will allow you to retry scaling when a job is not started. When enabled the scale up lambda will send a retry message to the SQS queue. The Job Retry lambda will check after a delay if the job is still queued, and if so, it will send a retry command to the scale up lambda via SQS. The feature is designed to be used with ephemeral runners. The feature is opt in, it will not be created by default.
 
 Consequences of enabling the feature are: