Small copy edit

Author: agjohnson

readthedocs-theme/templates/readthedocs/homepage.html

@@ -77,7 +77,7 @@ <h2 class="ui header">How it works</h2>
                   <img src="/theme/img/infographic-03.png"/>
                 </div>
                 <p>
-                  Setup your account with Read the Docs, add a <code>.readthedocs.yaml</code> file to set the configuration, and we'll do the rest!
+                  Set up your account with Read the Docs, add a <code>.readthedocs.yaml</code> file to set the configuration, and we'll do the rest!
                 </p>
               </div>