Update migration size limits and details in documentation (#57263)

Co-authored-by: hubwriter <hubwriter@github.com>

Author: tallzeebaa

content/migrations/using-github-enterprise-importer/migrating-between-github-products/about-migrations-between-github-products.md

@@ -57,12 +57,12 @@ User history for the above data | {% octicon "check" aria-label="Can be migrated
 Attachments (see [AUTOTITLE](/get-started/writing-on-github/working-with-advanced-formatting/attaching-files)) | {% octicon "check" aria-label="Can be migrated" %}  | {% octicon "check" aria-label="Can be migrated" %}  |
 Releases | {% octicon "x" aria-label="Cannot be migrated" %} | {% octicon "check" aria-label="Can be migrated" %}  |
 
-Different size limits per repository apply depending on your GHES version.
+Different size limits per repository apply to the compressed archive, depending on your GHES version.
 
-Limit | GHES <3.8.0 | GHES 3.8.0+ |
------ | ----------- | ----------- |
-Git source | 2GB | 10GB
-Metadata | 2GB | 10GB
+Limit | GHES <3.8.0 | GHES 3.8.x-3.11.x | GHES 3.12.x | GHES 3.13.0+
+----- | ----------- | ----------------- | ----------- | ------------
+Git source | 2GB | 10GB | 20GB | 40GB (public preview)
+Metadata | 2GB | 10GB | 20GB | 40GB (public preview)
 
 ### Data that is not migrated