Add note on CE fallback for unlicensed EE instances since 9.4

doc/user/admin_area/license.md

@@ -8,6 +8,10 @@ The license has the form of a base64 encoded ASCII text with a `.gitlab-license`
 extension and can be obtained when you [purchase one][pricing] or when you sign
 up for a [free trial].
 
+> **Note:** As of GitLab Enterprise Edition 9.4.0, a new EE instance without a valid license
+will only have CE features active. A trial license will activate all EE features,
+but the instance will fall back to CE only functionality after the trial expires.
+
 ## Uploading your license
 
 The very first time you visit your GitLab EE installation, you should see a