Docs: Highlight importance of batched background migrations

doc/update/index.md

@@ -72,13 +72,21 @@ from the chart version to GitLab version to determine the [upgrade path](#upgrad
 
 ## Checking for background migrations before upgrading
 
-Certain major/minor releases may require a set of background migrations to be
-finished. The number of remaining migrations jobs can be found by running the
-following command:
+Certain major/minor releases may require different migrations to be
+finished before you update to the newer version.
+
+**For GitLab 14.0 and newer**
+
+To check the status of [batched background migrations](../user/admin_area/monitoring/background_migrations.md):
+
+1. On the top bar, select **Menu >** **{admin}** **Admin**.
+1. On the left sidebar, select **Monitoring > Background Migrations**.
+
+   ![queued batched background migrations table](img/batched_background_migrations_queued_v14_0.png)
 
 **For Omnibus installations**
 
-If using GitLab 12.9 and newer, run:
+If using GitLab 12.9 and newer, also run:
 
 ```shell
 sudo gitlab-rails runner -e production 'puts Gitlab::BackgroundMigration.remaining'
@@ -107,12 +115,6 @@ Sidekiq::Queue.new("background_migration").size
 Sidekiq::ScheduledSet.new.select { |r| r.klass == 'BackgroundMigrationWorker' }.size
 ```
 
-### Batched background migrations
-
-Batched background migrations need to finish before you update to a newer version.
-
-Read more about [batched background migrations](../user/admin_area/monitoring/background_migrations.md).
-
 ### What do I do if my background migrations are stuck?
 
 WARNING:

doc/user/admin_area/monitoring/background_migrations.md

@@ -23,13 +23,8 @@ prevent integer overflow for some tables.
 
 ## Check the status of background migrations **(FREE SELF)**
 
-All migrations must have a `Finished` status before updating GitLab. To check the status of the existing
-migrations:
-
-1. On the top bar, select **Menu >** **{admin}** **Admin**.
-1. On the left sidebar, select **Monitoring > Background Migrations**.
-
-   ![queued batched background migrations table](img/batched_background_migrations_queued_v14_0.png)
+All migrations must have a `Finished` status before you [upgrade GitLab](../../../update/index.md).
+You can [check the status of existing migrations](../../../update/index.md#checking-for-background-migrations-before-upgrading).
 
 ## Enable or disable batched background migrations **(FREE SELF)**