Remove public beta notice.

Author: dkocher

protocols/smb.md

@@ -19,7 +19,7 @@ SMB
 :::{important}
 
 * Cyberduck [8.7.0](https://cyberduck.io/changelog/) or later required
-* Mountain Duck 5.0.0 required (Public Beta)
+* Mountain Duck 5.0.0 or later required
   :::
 
 To connect to a SMB server, choose _SMB (Server Message Block)_.