Merge pull request pantheon-systems#45 from jeffpaul/patch-1

Missing period

Thank you for the contribution @jeffpaul

Author: ataylorme

_pages/about.md

@@ -23,4 +23,4 @@ This is a living repository of knowledge. Help us improve this site and [contrib
 ### About the Site
 This site is made with [WordPress](https://wordpress.org/), was designed and built by a team at [Pantheon](https://pantheon.io/) and is a living example of all of these best practices in use.
 
-Our theme is built with the [Underscores starter theme](http://underscores.me/). Notable plugins include [WordPress GitHub Sync](https://github.com/mAAdhaTTah/wordpress-github-sync) and [GitHub Flavored Markdown for WordPress](https://github.com/makotokw/wp-gfm) to sync content from Github, [Google (XML) Sitemaps Generator for WordPress](http://www.arnebrachhold.de/projects/wordpress-plugins/google-xml-sitemaps-generator) to help our search engine friends and [WP Redis](https://wordpress.org/plugins/wp-redis/) to make use of Redis for [persistent object caching](./object-caching)
+Our theme is built with the [Underscores starter theme](http://underscores.me/). Notable plugins include [WordPress GitHub Sync](https://github.com/mAAdhaTTah/wordpress-github-sync) and [GitHub Flavored Markdown for WordPress](https://github.com/makotokw/wp-gfm) to sync content from Github, [Google (XML) Sitemaps Generator for WordPress](http://www.arnebrachhold.de/projects/wordpress-plugins/google-xml-sitemaps-generator) to help our search engine friends and [WP Redis](https://wordpress.org/plugins/wp-redis/) to make use of Redis for [persistent object caching](./object-caching).