Fix indentation of multiline descriptions

hacking/templates/rst.j2

@@ -79,7 +79,7 @@ Options
     {% else %}
     <td><ul>{% for choice in v.get('choices',[]) -%}<li>@{ choice }@</li>{% endfor -%}</ul></td>
     {% endif %}
-    <td>{% for desc in v.description -%}<div>@{ desc | html_ify }@</div>{% endfor -%} {% if 'aliases' in v and v.aliases -%}</br>
+    <td>{% for desc in v.description -%}<div>@{ desc | replace('\n', '\n    ') | html_ify }@</div>{% endfor -%} {% if 'aliases' in v and v.aliases -%}</br>
         <div style="font-size: small;">aliases: @{ v.aliases|join(', ') }@<div>{%- endif %}</td></tr>
     {% endfor %}
     </table>