Add missing "short" alternative to --date in rev-list-options.txt

Signed-off-by: Heikki Orsila <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: heikkiorsila

Documentation/rev-list-options.txt

@@ -13,7 +13,7 @@ include::pretty-options.txt[]
 
 	Synonym for `--date=relative`.
 
---date={relative,local,default,iso,rfc}::
+--date={relative,local,default,iso,rfc,short}::
 
 	Only takes effect for dates shown in human-readable format, such
 	as when using "--pretty".