fix capitalisation isss

index.html

@@ -467,12 +467,12 @@ <h3>Git</h3>
   </p>
   <p>
     You will need an account at <a href="https://github.com/">github.com</a>
-    for parts of the git lesson. Basic Github accounts are free. We encourage
-    you to create a Github account if you don't have one already.
+    for parts of the Git lesson. Basic GitHub accounts are free. We encourage
+    you to create a GitHub account if you don't have one already.
     Please consider what personal information you'd like to reveal. For
     example, you may want to review these
     <a href="https://help.github.com/articles/keeping-your-email-address-private/">instructions
-    for keeping your email address private</a> provided at Github.
+    for keeping your email address private</a> provided at GitHub.
   </p>
 
   <div class="row">