Update planned_failover_single_node.md

doc/administration/geo/disaster_recovery/runbooks/planned_failover_single_node.md

@@ -52,7 +52,7 @@ Before following any of those steps, make sure you have `root` access to the
 promote a Geo replica and perform a failover.
 
 NOTE:
-GitLab 13.9 through GitLab 14.3 are affected by a bug in which the Geo secondary site statuses will appear to stop updating and become unhealthy. For more information, see [Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode](../../replication/troubleshooting.md#geo-admin-area-shows-unhealthy-after-enabling-maintenance-mode).
+GitLab 13.9 through GitLab 14.3 are affected by a bug in which the Geo secondary site statuses appears to stop updating and become unhealthy. For more information, see [Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode](../../replication/troubleshooting.md#geo-admin-area-shows-unhealthy-after-enabling-maintenance-mode).
 
 On the **secondary** site, navigate to the **Admin Area > Geo** dashboard to
 review its status. Replicated objects (shown in green) should be close to 100%,
@@ -73,7 +73,7 @@ A common cause of replication failures is the data being missing on the
 **primary** site - you can resolve these failures by restoring the data from backup,
 or removing references to the missing data.
 
-The maintenance window won't end until Geo replication and verification is
+The maintenance window does not end until Geo replication and verification is
 completely finished. To keep the window as short as possible, you should
 ensure these processes are close to 100% as possible during active use.
 
@@ -123,7 +123,7 @@ follow these steps to avoid unnecessary data loss:
       1. On the Sidekiq dhasboard, select **Cron**.
       1. Select `Disable All` to disable any non-Geo periodic background jobs.
       1. Select `Enable` for the `geo_sidekiq_cron_config_worker` cron job.
-         This job will re-enable several other cron jobs that are essential for planned
+         This job re-enables several other cron jobs that are essential for planned
          failover to complete successfully.
 
 1. Finish replicating and verifying all data: