docs: migration_guide_4.1: entry for renamed device tree properties

add migration guide after renaming device tree properties
- pin_mask -> pin-mask
- pinmux_mask -> pinmux-mask
- vbatts_pins -> vbatts-pins
- bit_per_gpio -> bit-per-gpio
- off_val -> off-val
- on_val -> on-val

Signed-off-by: Jilay Pandya <[email protected]>

Author: jilaypandya

doc/releases/migration-guide-4.1.rst

@@ -172,6 +172,16 @@ Entropy
 GNSS
 ====
 
+GPIO
+====
+
+* Renamed the device tree property ``pin_mask`` to ``pin-mask``.
+* Renamed the device tree property ``pinmux_mask`` to ``pinmux-mask``.
+* Renamed the device tree property ``vbatts_pins`` to ``vbatts-pins``.
+* Renamed the device tree property ``bit_per_gpio`` to ``bit-per-gpio``.
+* Renamed the device tree property ``off_val`` to ``off-val``.
+* Renamed the device tree property ``on_val`` to ``on-val``.
+
 I2C
 ===