Document 'brew missing'.

Library/Contributions/examples/brew-missing.rb

@@ -3,7 +3,7 @@ require 'formula_installer'
 
 def main
   # Names of outdated brews; they count as installed.
-  outdated = outdated_brews.select {|b| b[1] }
+  outdated = outdated_brews.select {|b| b[1]}
 
   HOMEBREW_CELLAR.subdirs.each do |keg|
     next unless keg.subdirs

Library/Contributions/manpages/brew.1.md

@@ -171,6 +171,9 @@ Some external commands are shipped with Homebrew, and enabled by default.
   * `audit`:
     Checks all formulae for Homebrew coding style violations.
 
+  * `missing`:
+    Checks all installed formuale for missing dependencies.
+
 ## ENVIRONMENT
 
   * HOMEBREW\_DEBUG:

share/man/man1/brew.1

@@ -181,6 +181,10 @@ Downloads the tarball or checks out from VCS for the given \fIformula\fR\. For t
 \fBaudit\fR
 Checks all formulae for Homebrew coding style violations\.
 .
+.TP
+\fBmissing\fR
+Checks all installed formuale for missing dependencies\.
+.
 .SH "ENVIRONMENT"
 .
 .TP