Merge branch 'codyw-docs-visbility-levels' into 'master'

Update visibility level docs

See merge request gitlab-org/gitlab-ce!31258

doc/public_access/public_access.md

@@ -37,7 +37,7 @@ visibility setting keep this setting. You can read more about the change in the
 
 ### Private projects
 
-Private projects can only be cloned and viewed by project members.
+Private projects can only be cloned and viewed by project members (except for guests).
 
 They will appear in the public access directory (`/public`) for project members only.