dt-bindings: power: supply: Fix remaining battery.txt links

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/power/supply/battery.txt

-The contents of this file has been moved to battery.yaml
-
-Please note that not all charger drivers respect all of the properties.

Documentation/devicetree/bindings/power/supply/bq27xxx.yaml

@@ -66,7 +66,7 @@ properties:
        - charge-full-design-microamp-hours
        - voltage-min-design-microvolt
        Both or neither of the *-full-design-*-hours properties must be set.
-       See Documentation/devicetree/bindings/power/supply/battery.txt
+       See Documentation/devicetree/bindings/power/supply/battery.yaml
 
   power-supplies: true
 

Documentation/devicetree/bindings/power/supply/rohm,bd99954.yaml

@@ -110,7 +110,7 @@ properties:
 #     multipleOf: 64000
 #     a charge cycle terminates when the battery voltage is above recharge
 #     threshold, and the current is below this setting (7 in above chart)
-#   See also Documentation/devicetree/bindings/power/supply/battery.txt
+#   See also Documentation/devicetree/bindings/power/supply/battery.yaml
 
   reg:
     maxItems: 1