[DOCS] Explain when to run remove-workspace-local-backup-groups workflow (#3707)

## Changes
Explain when to run `remove-workspace-local-backup-groups` workflow as
the documentation was not clear about this.

### Functionality

- [x] added relevant user documentation

Author: JCZuurmond

docs/ucx/docs/reference/workflows/index.mdx

@@ -1,10 +1,9 @@
 # Workflows
 
-Part of this application is deployed as [Databricks Workflows](https://docs.databricks.com/en/workflows/index.html).
-You can view the status of deployed workflows via the [`workflows` command](/docs/reference/commands#workflows).
-Failed workflows can be fixed with the [`repair-run` command](/docs/reference/commands#repair-run).
-
-
+Part of UCX is deployed as [Databricks workflows](https://docs.databricks.com/en/workflows/index.html) to orchestrate
+steps of the [migration process](/docs/reference/process). You can view the status of deployed workflows through the
+[`workflows` command](/docs/reference/commands#workflows) and rerun failed workflows with the
+[`repair-run` command](/docs/reference/commands#repair-run).
 
 ## Assessment workflow
 
@@ -94,8 +93,6 @@ The UCX assessment workflow is designed to only run once, re-running will **not*
 inventory and findings for a workspace need to be updated then first reinstall UCX by [uninstalling](/docs/installation#uninstall-ucx)
 and [installing](/docs/installation) it again.
 
-
-
 ## Group migration workflow
 
 > You are required to complete the [assessment workflow](/docs/reference/workflows#assessment-workflow) before starting the group migration workflow.
@@ -149,18 +146,22 @@ executed after a successful run of the assessment workflow. The group migration
    destination groups.
 
 After successfully running the group migration workflow:
-1. Run the [`remove-workspace-local-backup-grups`](/docs/reference/commands#validate-groups-membership) to remove workspace-level backup
-   groups, along with their permissions. This should only be executed after confirming that the workspace-local
-   migration worked successfully for all the groups involved. This step is necessary to clean up the workspace and
-   remove any unnecessary groups and permissions.
+1. [Remove workspace-level backup groups](#remove-workspace-local-backup-groups) along with their
+   permissions.
 2. Proceed to the [table migration process](/docs/process#table-migration-process).
 
 For additional information see:
 - The [detailed design](/docs/reference/local-group-migration) of thie group migration workflow.
 - The [migration process diagram](/docs/process) showing the group migration workflow in context of the whole
   migration process.
 
+### Remove workspace local backup groups
 
+> Run this workflow only **after** the [group migration workflow](#group-migration-workflow)
+
+The `remove-workspace-local-backup-groups` removes the now renamed and redundant workspace-local groups along with their
+permissions. Run this workflow after confirming that the group migration is successful for all the groups involved.
+Running this workflow is optional but recommended to keep the workspace clean.
 
 ## Table migration workflows
 
@@ -239,9 +240,6 @@ The output is processed and displayed in the migration dashboard using the in `r
   - run the [`create-table-mapping` command](/docs/reference/commands#create-table-mapping)
     - or manually create a `mapping.csv` file in Workspace -> Applications -> ucx
 
-
-
-
 ## [EXPERIMENTAL] Migration Progress Workflow
 
 The `migration-progress-experimental` workflow populates the tables visualized in the