mercurial/templates/raw/logentry.tmpl

attr: make some docstrings raw strings

This avoids a SyntaxWarning in Python 3.8 due to invalid
\ escapes.

Differential Revision: https://phab.mercurial-scm.org/D5817

changeset:   {node}
revision:    {rev}
user:        {author}
date:        {date|rfc822date}
summary:     {desc}
{branches%branchname}{tags%tagname}{bookmarks%bookmarkname}