Update brew instructions, closes #2919

doc/00-intro.md

@@ -112,10 +112,10 @@ Composer is part of the homebrew-php project.
 
 ```sh
 brew update
-brew tap josegonzalez/homebrew-php
+brew tap homebrew/homebrew-php
 brew tap homebrew/versions
 brew install php55-intl
-brew install josegonzalez/php/composer
+brew install homebrew/php/composer
 ```
 
 ## Installation - Windows