Move usage instructions above the fold

Author: AA-Turner

README.rst

@@ -2,21 +2,29 @@ Sphinx Problem Matcher
 ======================
 
 This action adds a problem matcher that catches Sphinx warnings
-to show them neatly inside your pull request like this:
+to show them neatly inside your pull requests.
 
-.. image:: https://i.imgur.com/xkUMS1a.png
-   :alt: Example Screenshot
+Usage
+-----
 
-The common usage of this will be like so:
+We suggest using the action as shown below,
+simply running the action before building your documentation.
+
+**Note: This action does not handle actually building your docs.**
 
 .. code-block:: yaml
 
    - uses: sphinx-doc/github-problem-matcher@master
+
    - name: "Build docs"
      run: |
        cd docs
        make html
 
-That is, simply run this action before building your docs.
+Example
+-------
 
-**Note: this does not handle actually building your docs.**
+After using the action, files in pull requests will be annotated:
+
+.. image:: https://i.imgur.com/xkUMS1a.png
+   :alt: Example Screenshot