Clarified impossibility of shrinking SVN repo

Author: tknippenberg

content/en/docs/developerportal/general/team-server/migrate-to-git.md

@@ -39,6 +39,12 @@ The following criteria determine whether your app can be migrated to Git:
 
 In addition to the hard criteria mentioned above, a check is performed to determine whether your version control history can be migrated. To qualify for migrating your history, the size of your full SVN repository should be smaller than 3.5 GB.
 
+{{% alert type="info" %}}
+
+The eligibility check does not display your repository size and Support engineers do not have access to this information. Deleting branches in an attempt to reduce the server-side repository size does not have an effect, due to the nature of SVN.
+
+{{% /alert %}}
+
 ### Eligibility Check Outcomes
 
 #### Eligible for Migrating With History