Document `brew outdated --quiet`

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Library/Contributions/manpages/brew.1.md

@@ -190,8 +190,11 @@ For the full command list, see the COMMANDS section.
 
     If `--all` is passed, show options for all formulae.
 
-  * `outdated`:
-    Show formula that have an updated version available.
+  * `outdated [--quiet]`:
+    Show formulae that have an updated version available.
+
+    If `--quiet` is passed, list only the names of outdated brews. Otherwise,
+    the versions are printed as well.
 
   * `prune`:
     Remove dead symlinks from the Homebrew prefix. This is generally not

share/man/man1/brew.1

 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "BREW" "1" "August 2011" "Homebrew" "brew"
+.TH "BREW" "1" "September 2011" "Homebrew" "brew"
 .
 .SH "NAME"
 \fBbrew\fR \- The missing package manager for OS X
@@ -214,8 +214,11 @@ If \fB\-\-compact\fR is passed, show all options on a single line separated by s
 If \fB\-\-all\fR is passed, show options for all formulae\.
 .
 .TP
-\fBoutdated\fR
-Show formula that have an updated version available\.
+\fBoutdated [\-\-quiet]\fR
+Show formulae that have an updated version available\.
+.
+.IP
+If \fB\-\-quiet\fR is passed, list only the names of outdated brews\. Otherwise, the versions are printed as well\.
 .
 .TP
 \fBprune\fR