docs(demo): update description text

Author: netil

demo/index.html

@@ -129,7 +129,7 @@ <h2 id="title"></h2>
                             <div class="chart_area">
                                 <h1>billboard.js examples</h1>
                                 <p>
-                                    Checkout total of <span class="item_count"></span> examples, by clicking menu <span class="by_text"></span>.
+                                    Explore all <span class="item_count"></span> examples from the left menu list.
                                 </p>
 
                                 <h4>Supported chart types</h4>