Bug 578773 - Prune cvs from docs

Remove from o.e.platform.doc.user

Change-Id: I0676ddf1a12a0af7c8b46086015cfb91badaf4c1
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.common/+/190844
Tested-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>