Documentation: fix ref to gpio.txt

Signed-off-by: Tom Saeger <tom.saeger@oracle.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Tom Saeger 2017-10-12 15:24:16 -05:00 • committed by Linus Walleij
commit 0747c3ecfb