config: test for --replace-all with one argument and fix documentation.

Option --replace-all only allows at least two arguments, so
documentation was needing to be updated accordingly. A test showing
that the command fails with only one parameter is also provided.
Signed-off-by: NCarlos Rica <jasampler@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/git-config.txt

@@ -11,7 +11,7 @@ SYNOPSIS
 [verse]
 'git config' [<file-option>] [type] [-z|--null] name [value [value_regex]]
 'git config' [<file-option>] [type] --add name value
-'git config' [<file-option>] [type] --replace-all name [value [value_regex]]
+'git config' [<file-option>] [type] --replace-all name value [value_regex]
 'git config' [<file-option>] [type] [-z|--null] --get name [value_regex]
 'git config' [<file-option>] [type] [-z|--null] --get-all name [value_regex]
 'git config' [<file-option>] [type] [-z|--null] --get-regexp name_regex [value_regex]

builtin-config.c

@@ -55,7 +55,7 @@ static struct option builtin_config_options[] = {
 	OPT_BIT(0, "get", &actions, "get value: name [value-regex]", ACTION_GET),
 	OPT_BIT(0, "get-all", &actions, "get all values: key [value-regex]", ACTION_GET_ALL),
 	OPT_BIT(0, "get-regexp", &actions, "get values for regexp: name-regex [value-regex]", ACTION_GET_REGEXP),
-	OPT_BIT(0, "replace-all", &actions, "replace all matching variables: name [value [value_regex]", ACTION_REPLACE_ALL),
+	OPT_BIT(0, "replace-all", &actions, "replace all matching variables: name value [value_regex]", ACTION_REPLACE_ALL),
 	OPT_BIT(0, "add", &actions, "adds a new variable: name value", ACTION_ADD),
 	OPT_BIT(0, "unset", &actions, "removes a variable: name [value-regex]", ACTION_UNSET),
 	OPT_BIT(0, "unset-all", &actions, "removes all matches: name [value-regex]", ACTION_UNSET_ALL),

t/t1300-repo-config.sh

@@ -118,7 +118,14 @@ EOF
 
 test_expect_success 'multiple unset is correct' 'cmp .git/config expect'
 
-mv .git/config2 .git/config
+cp .git/config2 .git/config
+
+test_expect_success '--replace-all missing value' '
+	test_must_fail git config --replace-all beta.haha &&
+	test_cmp .git/config2 .git/config
+'
+
+rm .git/config2
 
 test_expect_success '--replace-all' \
 	'git config --replace-all beta.haha gamma'