Staging: telephony: remove unneeded Documentation

Joe pointed out that I forgot to remove the documentation, so do that
here.

Cc: Joe Perches <joe@perches.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/telephony/00-INDEX

-00-INDEX
-	- this file.
-ixj.txt
-	- document describing the Quicknet drivers.