Update readme to reflect parameter change

Author: pritishpai

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

@@ -98,7 +98,8 @@ See [this guide](/docs/reference/assessment) for more details.
 Proceed to the [group migration workflow](/docs/reference/workflows#group-migration-workflow) below or go back to the
 [migration process diagram](/docs/process/).
 
-> **⚠️ Caution:** Re-running the UCX assessment workflow will **overwrite existing results**. For large workspaces, this process can take a significant amount of time and consume substantial resources. Only re-run if you are certain it is necessary.
+> ⚠️ Caution: To fully refresh the UCX assessment workflow and overwrite existing results, set the force_refresh parameter to true (or True).
+  For large workspaces, this process can be time-consuming and resource-intensive. Only use this option if a complete reassessment is absolutely necessary.
 
 ## Group migration workflow