Added doc for new config properties introduced in spark #479 (#12)

Author: liyinan926

src/jekyll/running-on-kubernetes.md

@@ -837,6 +837,22 @@ from the other deployment modes. See the [configuration page](configuration.html
      the Driver process. The user can specify multiple of these to set multiple environment variables.
    </td>
  </tr>
+ <tr>
+   <td><code>spark.kubernetes.driver.secrets.[SecretName]</code></td>
+   <td>(none)</td>
+   <td>
+     Mounts the Kubernetes secret named <code>SecretName</code> onto the path specified by the value
+     in the driver Pod. The user can specify multiple instances of this for multiple secrets.
+   </td>
+ </tr>
+ <tr>
+   <td><code>spark.kubernetes.executor.secrets.[SecretName]</code></td>
+   <td>(none)</td>
+   <td>
+     Mounts the Kubernetes secret named <code>SecretName</code> onto the path specified by the value
+     in the executor Pods. The user can specify multiple instances of this for multiple secrets.
+   </td>
+ </tr>
 </table>