refactor(pm_wakeup_sources): Fix inconsistent style for DTS node

For the MCU GPIO wakeup node, there is an explanation of what each
property does. The explanation mixed different styles. Fix the styles
and explanation to be consistent.

Signed-off-by: Kendall Willis <[email protected]>

Author: kwillis01

source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst

@@ -364,7 +364,8 @@ MCU GPIO
                   wakeup-source;
       };
 
-   #. The label is the descriptive name of the key. The string will reflect under /proc/interrupts as:
+   #. label: Descriptive name of the switch node. If the MCU GPIO node is setup
+      correctly, the label will appear under /proc/interrupts:
 
        .. code-block:: console
 
@@ -373,8 +374,9 @@ MCU GPIO
 
    #. linux,code: Keycode to emit.
    #. gpios: the gpio required to be used as the gpio-key.
-   #. The `wakeup-source <https://www.kernel.org/doc/Documentation/devicetree/bindings/power/wakeup-source.txt>`__ property describes
-      devices which have wakeup capability.
+   #. wakeup-source:
+      `wakeup-source <https://www.kernel.org/doc/Documentation/devicetree/bindings/power/wakeup-source.txt>`__
+      property describes devices which have wakeup capability.
 
    This indicates that gpio_keys can wake-up the system from Deep Sleep or MCU Only mode.