* lisp/gnus/gnus.el (gnus-server-alist): Expand docstring.
* lisp/gnus/gnus-srvr.el (gnus-server-kill-server,
gnus-server-edit-server): Return error messages that tell the user
what the actual problem is.
* doc/misc/gnus.texi (Server Commands): Note that not all servers are
editable via the server buffer.
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