git-for-each-ref.txt: minor improvements

Rewrapped synopsis and removed wrong asterisk behind --count option;
clarified --sort=<key> description for multiple keys; documented that
for-each-ref supports not only glob patterns but also prefixes like
"refs/heads" as patterns, and that multiple patterns can be given.

Signed-off-by: Lea Wiemann <LeWiemann@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-for-each-ref.txt

@@ -8,9 +8,8 @@ git-for-each-ref - Output information on each ref
 SYNOPSIS
 --------
 [verse]
-'git-for-each-ref' [--count=<count>]\*
-                   [--shell|--perl|--python|--tcl]
-                   [--sort=<key>]\* [--format=<format>] [<pattern>]
+'git-for-each-ref' [--count=<count>] [--shell|--perl|--python|--tcl]
+		   [--sort=<key>]\* [--format=<format>] [<pattern>...]
 
 DESCRIPTION
 -----------
@@ -32,8 +31,9 @@ OPTIONS
 <key>::
 	A field name to sort on.  Prefix `-` to sort in
 	descending order of the value.  When unspecified,
-	`refname` is used.  More than one sort keys can be
-	given.
+	`refname` is used.  You may use the --sort=<key> option
+	multiple times, in which case the last key becomes the primary
+	key.
 
 <format>::
 	A string that interpolates `%(fieldname)` from the
@@ -48,9 +48,10 @@ OPTIONS
 	`%09` to `\t` (TAB) and `%0a` to `\n` (LF).
 
 <pattern>::
-	If given, the name of the ref is matched against this
-	using fnmatch(3).  Refs that do not match the pattern
-	are not shown.
+	If one or more patterns are given, only refs are shown that
+	match againt at least one pattern, either using fnmatch(3) or
+	literally, in the latter case matching completely or from the
+	beginning up to a slash.
 
 --shell, --perl, --python, --tcl::
 	If given, strings that substitute `%(fieldname)`