Documentation: bindings: fix palmas-rtc documentation

change 100mA -> 100uA
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/rtc/rtc-palmas.txt

@@ -15,9 +15,9 @@ Optional properties:
 	battery is chargeable or not. If charging battery then driver can
 	enable the charging.
 - ti,backup-battery-charge-high-current: Enable high current charging in
-	backup battery. Device supports the < 100mA and > 100mA charging.
-	The high current will be > 100mA. Absence of this property will
-	charge battery to lower current i.e. < 100mA.
+	backup battery. Device supports the < 100uA and > 100uA charging.
+	The high current will be > 100uA. Absence of this property will
+	charge battery to lower current i.e. < 100uA.
 
 Example:
 	palmas: tps65913@58 {