config.txt: 'interactive.singlekey; is used by...

The config variable 'interactive.singlekey' influences also '--patch' mode of
git-add, git-reset, and git-checkout.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Valentin Haenel <valentin.haenel@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config.txt

@@ -1349,8 +1349,9 @@ instaweb.port::
 interactive.singlekey::
 	In interactive commands, allow the user to provide one-letter
 	input with a single key (i.e., without hitting enter).
-	Currently this is used only by the `\--patch` mode of
-	linkgit:git-add[1].  Note that this setting is silently
+	Currently this is used by the `\--patch` mode of
+	linkgit:git-add[1], linkgit:git-reset[1], linkgit:git-stash[1] and
+	linkgit:git-checkout[1]. Note that this setting is silently
 	ignored if portable keystroke input is not available.
 
 log.date::