Replace "&" with "and"

Author: simon04

content/concepts/index.md

@@ -8,7 +8,7 @@ contributors:
   - johnstew
 ---
 
-*webpack* is a _module bundler_ for modern JavaScript applications. It is [incredibly configurable](/configuration), but to get started you only need to understand **Four Core Concepts**: entry, output, loaders, & plugins.
+*webpack* is a _module bundler_ for modern JavaScript applications. It is [incredibly configurable](/configuration), but to get started you only need to understand **Four Core Concepts**: entry, output, loaders, and plugins.
 
 This document is intended to give a **high-level** overview of these concepts, while providing links to detailed concept specific use-cases.