Documentation: use 'keyid' consistently, not 'key-id'

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/git-cherry-pick.txt b/Documentation/git-cherry-pick.txt
index 1147c71..66ab297 100644
--- a/Documentation/git-cherry-pick.txt
+++ b/Documentation/git-cherry-pick.txt
@@ -9,7 +9,7 @@
 --------
 [verse]
 'git cherry-pick' [--edit] [-n] [-m parent-number] [-s] [-x] [--ff]
-		  [-S[<key-id>]] <commit>...
+		  [-S[<keyid>]] <commit>...
 'git cherry-pick' --continue
 'git cherry-pick' --quit
 'git cherry-pick' --abort
@@ -101,8 +101,8 @@
 --signoff::
 	Add Signed-off-by line at the end of the commit message.
 
--S[<key-id>]::
---gpg-sign[=<key-id>]::
+-S[<keyid>]::
+--gpg-sign[=<keyid>]::
 	GPG-sign commits.
 
 --ff::