help: add "show" as a valid configuration value

Add a literal value for showing the suggested autocorrection
for consistency with the rest of the help.autocorrect options.

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config/help.txt

@@ -11,7 +11,7 @@ help.autoCorrect::
 	If git detects typos and can identify exactly one valid command similar
 	to the error, git will try to suggest the correct command or even
 	run the suggestion automatically. Possible config values are:
-	 - 0, "false", "off", "no": show the suggested command (default).
+	 - 0, "false", "off", "no", "show": show the suggested command (default).
 	 - 1, "true", "on", "yes", "immediate": run the suggested command
 immediately.
 	 - positive number > 1: run the suggested command after specified

help.c

@@ -574,6 +574,8 @@ static int parse_autocorrect(const char *value)
 		return AUTOCORRECT_NEVER;
 	if (!strcmp(value, "immediate"))
 		return AUTOCORRECT_IMMEDIATELY;
+	if (!strcmp(value, "show"))
+		return AUTOCORRECT_SHOW;
 
 	return 0;
 }

t/t9003-help-autocorrect.sh

@@ -28,7 +28,7 @@ test_expect_success 'setup' '
 	test_cmp expect actual
 '
 
-for show in false no off 0
+for show in false no off 0 show
 do
 	test_expect_success 'autocorrect showing candidates' '
 		git config help.autocorrect $show &&