Update the Demo Page

Author: mdmintz

examples/offline_examples/demo_page.html

@@ -390,7 +390,7 @@ <h4>iFrame%20Text<%2Fh4></body>"></iframe>
                                    name="checkBoxName4" class="checkBoxClassB"/>
                         </td>
                         <td style="width: 150px">
-                            Pre-Checked Box:
+                            Pre-Check Box:
                             <input type="checkbox" id="checkBox5"
                                    name="checkBoxName5" class="checkBoxClassC" checked />
                         </td>