Swap italics to code formatting and add hyperlink

modules/environment/README.md

@@ -13,13 +13,14 @@ Contributors
 
 This module **MUST NOT** rely on any command not built in Zsh.
 
-Non-interactive environment variables should be defined in *zshenv*.
+Non-interactive environment variables should be defined in [`zshenv`][1].
 
 Authors
 -------
 
-*The authors of this module should be contacted via the [issue tracker][1].*
+*The authors of this module should be contacted via the [issue tracker][2].*
 
   - [Sorin Ionescu](https://github.com/sorin-ionescu)
 
-[1]: https://github.com/sorin-ionescu/prezto/issues
+[1]: https://github.com/sorin-ionescu/prezto/blob/master/runcoms/zshenv
+[2]: https://github.com/sorin-ionescu/prezto/issues