Documentation: kgdb: eliminate duplicated word

Drop the doubled word "driver".

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: kgdb-bugreport@lists.sourceforge.net
Link: https://lore.kernel.org/r/20200707180414.10467-5-rdunlap@infradead.org


Signed-off-by: Jonathan Corbet <corbet@lwn.net>