Fix erroneous snippet index in git lesson
@@ -61,7 +61,7 @@ Once we've used `git add` to include all the changes we want to commit into stag
```
git commit -m "My first commit!"
```
-<button type="button" class="btn btn-primary btn-sm" onclick="runSnippetInTab('linux1',5)">Run this snippet</button>
+<button type="button" class="btn btn-primary btn-sm" onclick="runSnippetInTab('linux1', this)">Run this snippet</button>
> Note the use of the `-m` flag to specify the commit message inline - you can omit this if you wish, and Git will open a text editor for you to specify your commit message
