Documentation: ABI: testing: Fix "upto" typo in rtc-cdev

The word "upto" is a common typo for "up to". Correct this.

Signed-off-by: Akiyoshi Kurita <weibu@redadmin.org>
Link: https://patch.msgid.link/20251112113759.2953758-1-weibu@redadmin.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: redadmin-org

Documentation/ABI/testing/rtc-cdev

@@ -14,7 +14,7 @@ Description:
 		  for RTCs that support alarms
 
 		* RTC_ALM_READ, RTC_ALM_SET: Read or set the alarm time for
-		  RTCs that support alarms. Can be set upto 24 hours in the
+		  RTCs that support alarms. Can be set up to 24 hours in the
 		  future. Requires a separate RTC_AIE_ON call to enable the
 		  alarm interrupt. (Prefer to use RTC_WKALM_*)