Adding some info texts and fixing one small mistake

examples/pitch-yaw-parameters.html

@@ -16,5 +16,6 @@
         <div id="horizontal"></div>
         <div id="vertical"></div>
     </div>
+    <p>Open the console to see pitch and yaw values of the eyehole in order to know where to place the hotspots</p>
 </body>
 </html>