Add a note about ssh root password on SL Micro 6

adoc/miscellaneous-micro.adoc

@@ -28,3 +28,10 @@ The plugin is installed as part of the following package:
 
 When you run the toolbox script to pull and start the toolbox container, a previous version of the container image is pulled.
 This does not influence toolbox funcionality and you can use the toolbox container as needed.
+
+=== Password access as root via ssh disabled
+
+SLE Micro releases 5.x, password-based root-login was allowed but with SLE Micro 6.0 the default was changed to only allow key-based authentication.
+Systems upgraded to 6.0 from 5.x carry over the old behavior. New installations will enforce the new behavior.
+
+Installing the package "openssh-server-config-rootlogin" restores the old behavior and allows password-based login for the root user.