Fix link in c1s1

Author: tomclose

_sessions/c1s1/7_more_html.md

@@ -3,7 +3,7 @@ title: More HTML
 ---
 
 {% exercise %}
-2. Go to the github repository for this session: [https://github.com/code61/learning_html]()
+2. Go to the github repository for this session: [https://github.com/code61/learning_html](https://github.com/code61/learning_html)
 3. *Clone* the repository down into your `coding_course` folder (by clicking 'Clone in Desktop' in the bottom right).
 4. Open the whole folder in Sublime Text
 5. Open the file `example.html` in Chrome and look around with the developer tools