Update 05-repositories.md

Typo, which is best addressed as a small rewrite.

doc/05-repositories.md

@@ -463,8 +463,8 @@ there are some use cases for hosting your own repository.
   might want to keep them separate to packagist. An example of this would be
   wordpress plugins.
 
-When hosting your own package repository it is recommended to use a `composer`
-one. This is type that is native to composer and yields the best performance.
+For hosting your own packages, a native `composer` type of repository is 
+recommended, which provides the best performance.
 
 There are a few tools that can help you create a `composer` repository.