[doc] Do not rely on lgc's sphinx_ext
This module is broken (getting an ImportError) and I don't want to fix
it. The only usage we make of it is for the "autodocstring" directive,
and I don't know what it does.
Based on the context, replacing autodocstring with either automodule or
autoclass and removing sphinx_ext from required Sphinx extensions.
<table class="attributeForm" style="width:100%;"
tal:attributes="id tab_id | nothing;
class tab_class | nothing;">
<tr tal:iter="widget lines">
<th class="labelCol" tal:content="structure python:widget.render_label(entity)">attrname</th>
<td tal:define="error python:widget.render_error(entity)" style="width:100%;"
tal:attributes="class python:error and 'error' or nothing">
<div tal:replace="structure error">error message if any</div>
<div tal:replace="structure python:widget.edit_render(entity)" >widget (input, textarea, etc.)</div>
<div tal:replace="structure python:widget.render_help(entity)">format help if any</div>
</td>
</tr>
</table>