Fix typo

Author: tomclose

_sessions/c1s2/1_using_git.md

@@ -2,6 +2,13 @@
 title:  "Intro to Git"
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 Git is a version control system. It allows you to keep the entire history of your code, and makes it easy to share and collaborate with others.
 
 ### Setting up a git repo

_sessions/c1s2/2_pushing_to_github.md

@@ -17,7 +17,7 @@ There are several ways of getting GitHub to publish your site as a GitHub page.
 
 To push code up to GitHub, in the GitHub app select the 'Push to Github' button (on the top right). You'll be prompted to choose a name (which might as well be `first_site`).
 
-{% endexercise %}
+{% exercise %}
 1. Log in to GitHub and check you've verified your email address.
 1. In the 'Branches' panel of the GitHub app, change the name of the current branch from `master` to `gh-pages`.
 2. Click the 'Push to Github' button in the GitHub app.