pinctl: doc: Fix spelling mistake "resisitors" -> "resistors"

There is a spelling mistake in the documentation. Fix it.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220202091551.580372-1-colin.i.king@gmail.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>