Fix help-modal cheatsheet typo

Author: jackycute

public/views/help-modal.ejs

@@ -93,7 +93,7 @@
                                         </tr>
                                         <tr>
                                             <td>Image</td>
-                                            <td>![alt](http:// title)</td>
+                                            <td>![alt](http:// "title")</td>
                                         </tr>
                                         <tr>
                                             <td><code>Code</code></td>