Website: Updated plugin header template (#3144)

Author: RunDevelopment

assets/templates/header-main.html

@@ -4,7 +4,7 @@ <h1><a href="index.html"><img src="assets/logo.svg" alt="Prism" /></a></h1>
 
 <p>
 	Prism is a lightweight, extensible syntax highlighter, built with modern web standards in mind.
- 	It’s used in millions of websites, including some of those you visit daily.
+	It’s used in millions of websites, including some of those you visit daily.
 </p>
 
 <!--<a href="https://twitter.com/share" class="twitter-share-button" data-via="prismjs" data-size="large" data-related="LeaVerou">Tweet</a>

assets/templates/header-plugins.html

@@ -4,5 +4,5 @@ <h1><a href="index.html"><img src="assets/logo.svg" alt="Prism" /> plugins</a></
 
 <p>
 	Prism is a lightweight, extensible syntax highlighter, built with modern web standards in mind.
- 	It’s used in thousands of websites, including some of those you visit daily.
+	It’s used in millions of websites, including some of those you visit daily.
 </p>