Update overview.rst

Author: damien-louis

contributing/documentation/overview.rst

@@ -28,8 +28,10 @@ and you'll be redirected to GitHub:
     :alt: The "Edit this page" button is located directly below the first heading.
     :class: with-browser
 
-**Step 2.** If this is your first contribution, you have to fork the repository. Then, edit the contents, preview your changes (with the button at the top left) and click on the
-**Commit changes...** button. In the popup, describe your changes and click on **Propose changes** button.
+**Step 2.** If this is your first contribution, you have to fork the repository. 
+Then, edit the contents, preview your changes (with the button at the top left) 
+and click on the **Commit changes...** button. In the popup, describe your changes 
+and click on **Propose changes** button.
 
 **Step 3.** GitHub will now create a branch and a commit for your changes and it will
 also display a preview of your changes: