Update index.md

Signed-off-by: Justin Kenyon <kenyonj@github.com>

Author: kenyonj

topics/composer/index.md

@@ -1,10 +1,10 @@
 ---
-aliases: packagist,composer-package,packagist-package
+aliases: packagist, composer-package, packagist-package
 created_by: Nils Adermann, Jordi Boggiano
 display_name: Composer
 github_url: https://github.com/composer
 logo: composer.png
-related: php,package-manager
+related: php, package-manager
 released: March 1, 2012
 short_description: A tool for dependency management in PHP.
 topic: composer