docs: ia64: correct typo

Replace RTC_WKLAM_RD with RTC_WKALM_RD.
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>

Link: https://lore.kernel.org/r/1596104250-32673-1-git-send-email-Julia.Lawall@inria.frSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/ia64/efirtc.rst

@@ -113,7 +113,7 @@ We have added 2 new ioctl()s that are specific to the EFI driver:
 
 	Read the current state of the alarm::
 
-		ioctl(d, RTC_WKLAM_RD, &wkt)
+		ioctl(d, RTC_WKALM_RD, &wkt)
 
 	Set the alarm or change its status::