updating docs for issue processing/p5.js-website#132

Author: Lauren McCarthy

docs/yuidoc-p5-theme/layouts/main.handlebars

@@ -57,7 +57,7 @@
             <li><a href="{{p5SiteRoot}}/get-started/">Start</a></li>
             <li><a href="{{p5SiteRoot}}/reference/">Reference</a></li>
             <li><a href="{{p5SiteRoot}}/libraries/">Libraries</a></li>
-            <li><a href="{{p5SiteRoot}}/tutorials/">Tutorials</a></li>
+            <li><a href="{{p5SiteRoot}}/learn/">Learn</a></li>
             <li><a href="{{p5SiteRoot}}/examples/">Examples</a></li>
             <li><a href="{{p5SiteRoot}}/books/">Books</a></li>
             <li><a href="{{p5SiteRoot}}/community/">Community</a></li>