code: def help(handler):
      
      data = {'operation': 'describe'}
      response = handler.invoke(data, raw=True)
      description = response.data
      lines = []
      lines.append('# {}'.format(handler.lambda_fn))
      lines.append('## Handler Info')
      lines.append('**Cruddy version**: {}'.format(
          description['cruddy_version']))
      lines.append('')
      lines.append('**Table name**: {}'.format(description['table_name']))
      lines.append('')
      lines.append('**Supported operations**:')
      lines.append('')
      for op in description['supported_operations']:
          lines.append('* {}'.format(op))
      lines.append('')
      lines.append('**Prototype**:')
      lines.append('')
      lines.append('```')
      lines.append(str(description['prototype']))
      lines.append('```')
      lines.append('')
      lines.append('## Operations')
      for op_name in description['operations']:
          op = description['operations'][op_name]
          lines.append('### {}'.format(op_name))
          lines.append('')
          lines.append(_build_signature_line(
              op_name, description['operations'][op_name]['argspec']))
          lines.append('')
          if op['docs'] is None:
              lines.append('')
          else:
              lines.append(op['docs'])
          lines.append('')
      click.echo('\n'.join(lines))
docs: Returns a Markdown document that describes this handler and
      it's operations.