kdbus: Fix CONFIG_KDBUS help text

kdbus: Fix CONFIG_KDBUS help text

Drop a left-over from the times when documentation lived in a
simple text file, which is no longer the case. Mention the
auto-generated man-pages and HTML files instead.

Change-Id: I9c2c665536149b7e171facdd8976c6d1dff6d132
Reported-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Daniel Mack <daniel@zonque.org>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paul Osmialowski <p.osmialowsk@samsung.com>