Remove a misleading comment about self.render() behavior.
The former comment suggested that View.render called with 'row' or 'col' would
set cw_row or cw_col, which is not (anymore ?) accurate.
Related to #3696871.
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html