git-config: Correct asciidoc documentation for --int/--bool

The asciidoc documentation seemed to indicate that type specifiers
are honoured on writing operations which they aren't. Make this
more clear.

Signed-off-by: Frank Lichtenheld <frank@lichtenheld.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Documentation/git-config.txt

@@ -9,15 +9,15 @@ git-config - Get and set repository or global options
 SYNOPSIS
 --------
 [verse]
-'git-config' [--system | --global] [type] name [value [value_regex]]
-'git-config' [--system | --global] [type] --add name value
-'git-config' [--system | --global] [type] --replace-all name [value [value_regex]]
+'git-config' [--system | --global] name [value [value_regex]]
+'git-config' [--system | --global] --add name value
+'git-config' [--system | --global] --replace-all name [value [value_regex]]
 'git-config' [--system | --global] [type] --get name [value_regex]
 'git-config' [--system | --global] [type] --get-all name [value_regex]
-'git-config' [--system | --global] [type] --unset name [value_regex]
-'git-config' [--system | --global] [type] --unset-all name [value_regex]
-'git-config' [--system | --global] [type] --rename-section old_name new_name
-'git-config' [--system | --global] [type] --remove-section name
+'git-config' [--system | --global] --unset name [value_regex]
+'git-config' [--system | --global] --unset-all name [value_regex]
+'git-config' [--system | --global] --rename-section old_name new_name
+'git-config' [--system | --global] --remove-section name
 'git-config' [--system | --global] -l | --list
 
 DESCRIPTION
@@ -36,7 +36,8 @@ prepend a single exclamation mark in front (see EXAMPLES).
 The type specifier can be either '--int' or '--bool', which will make
 'git-config' ensure that the variable(s) are of the given type and
 convert the value to the canonical form (simple decimal number for int,
-a "true" or "false" string for bool). If no type specifier is passed,
+a "true" or "false" string for bool).  Type specifiers currently only
+take effect for reading operations.  If no type specifier is passed,
 no checks or transformations are performed on the value.
 
 This command will fail if: