git help: remove whatchanged from list of common commands

whatchanged is replaced by git log now.

Signed-off-by: Martin Waitz
Signed-off-by: NJunio C Hamano <junkio@cox.net>

generate-cmdlist.sh

@@ -37,7 +37,6 @@ show-branch
 status
 tag
 verify-tag
-whatchanged
 EOF
 while read cmd
 do