made README and toolbox tweaks

Author: seankross

README.md

@@ -4,7 +4,7 @@ Since the beginning of the Data Science Specialization we've noticed the unbelie
 
 ## Contributing
 
-If you've created a web page, a video, a sideshow, or any other kind of media you think should be shared through this directory you should:
+If you've created a web page, video, sideshow, or any other kind of media you think should be shared through this directory you should:
 
 1. Fork this repository.
 2. Add a link to your content on the appropriate course page.

toolbox.md

@@ -4,6 +4,8 @@ title: The Data Scientist's Toolbox
 permalink: /toolbox/
 ---
 
+## Command Line
+
 ## Git/GitHub
 
 - [Git & GitHub Video Playlist](https://www.youtube.com/playlist?list=PL5-da3qGB5IBLMp7LtN8Nc3Efd4hJq0kD)