docs/service: Document bind-create-mountpoint

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

Author: ndeloof

docs/reference/commandline/service_create.md

@@ -457,6 +457,22 @@ The following options can only be used for bind mounts (`type=bind`):
       When the option is not specified, the default behavior corresponds to setting <tt>enabled</tt>.
     </td>
   </tr>
+  <tr>
+    <td><b>bind-create-mountpoint</b></td>
+    <td>
+      By default, bind mounts require the source path to exist on the host. This is a significant difference
+      from the <tt>-v</tt> flag, which creates the source path if it doesn't exist.<br />
+      <br />
+      Set <tt>bind-create-mountpoint</tt> to create the source path on the host if it doesn't exist.<br />
+      <br />
+      A value is optional:<br />
+      <br />
+      <ul>
+        <li><tt>true</tt> or <tt>1</tt>: Create path on host if it doesn't exist.</li>
+        <li><tt>false</tt> or <tt>0</tt>: Default behavior. If source path doesn't exist, an error will be reported.</li>
+      </ul>
+    </td>
+  </tr>
 </table>
 
 ##### Bind propagation