Update docs/webadministration.rst

Rewording to make it more clear.

Co-authored-by: Dario Ernst <github@kanojo.de>

docs/webadministration.rst

@@ -48,7 +48,7 @@ Access the web administration interface
 The admin GUI is accessed via the URL `https://<my domain>/admin` for default deployments.
 To login the admin GUI enter the email address and password of an user.
 
-To have access to all configuration settings and for access to Rspamd webgui, the logged in user must be a global administrator.
+Only global administrator users have access to all configuration settings and the Rspamd webgui. Other users will be presented with settings for only their account, and domains they are managers of.
 To create a user who is a global administrator for a new installation, the Mailu.env file can be adapted. 
 For more information see the section 'Admin account - automatic creation' in :ref:`the configuration reference <admin_account>`.