dt-bindings: pinctrl: pinctrl-single: Fix pinctrl-single,gpio-range description

dt-bindings: pinctrl: pinctrl-single: Fix pinctrl-single,gpio-range description

The binding is supposed to describe the properties of each element
of the pinctrl-single,gpio-range array entry, however when we use
"- items:" instead of "items:", it explicitly describes that there
is just a single entry in the array.

The pinctrl-single,gpio-range property should describe more than one
entry in the array. Fix the typo and adjust the alignment of the
description of the entries appropriately.

Fixes: 677a62482bd6 ("dt-bindings: pinctrl: Update pinctrl-single to use yaml")
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/20240627150610.469645-1-nm@ti.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>