docs: update migration admonition (supabase#38101)

* docs: update migration admonition

* chore: refine messaging

* chore: oops, small typo fixed

* actually, it was fine. moving too fast

* chore: update wording

---------

Co-authored-by: Rodrigo Mansueli <[email protected]>
Co-authored-by: Terry Sutton <[email protected]>

Author: 3 people

apps/docs/content/_partials/migration_warnings.mdx

@@ -2,8 +2,6 @@
 
 - If you're planning to migrate a database larger than 6 GB, we recommend [upgrading to at least a Large compute add-on](/docs/guides/platform/compute-add-ons). This will ensure you have the necessary resources to handle the migration efficiently.
 
-- For databases smaller than 150 GB, you can increase the size of the disk on paid projects by navigating to the [Compute and Disk Settings](dashboard/project/_/settings/compute-and-disk) page.
-
-- If you're dealing with a database larger than 150 GB, we strongly advise you to [contact our support team](/dashboard/support/new) for assistance in provisioning the required resources and ensuring a smooth migration process.
+- We strongly advise you to pre-provision the disk space you will need for your migration. On paid projects, you can do this by navigating to the [Compute and Disk Settings](https://supabase.com/dashboard/project/_/settings/compute-and-disk) page. For more information on disk scaling and disk limits, check out our [disk settings](https://supabase.com/docs/guides/platform/compute-and-disk#disk) documentation.
 
 </Admonition>