Updates readme.txt details

git-svn-id: https://plugins.svn.wordpress.org/prismatic/trunk@2142188 b8457f37-d9ea-0310-8a92-e5e31aec5664

readme.txt

@@ -127,7 +127,7 @@ _[More info on installing WP plugins](https://codex.wordpress.org/Managing_Plugi
 
 **Quick Start Guide**
 
-Here is a quick guide to started with Prismatic:
+Here is a quick guide to get started with Prismatic:
 
 1. Activate the plugin and visit the Prismatic settings page
 2. Choose Prism.js or Highlight.js for syntax highlighting