(tiny change) Clarify "-name" option is Xt-only

(tiny change) Clarify "-name" option is Xt-only

There's a set of standard options with will get used by Xt, before Xboard
itself will use them.  "-name" is an Xt-only option which will set the name
and resource of the window to the value requested.  It has nothing to do
with setting opponent/player names.

Signed-off-by: Thomas Adam <thomas@fvwm.org>

modified slightly by Arun Persaud (renamed itemx to item and fixed option name for CMAIL)