mercurial/templates/rss/error.tmpl

help: document the new [command-templates] config section

Differential Revision: https://phab.mercurial-scm.org/D9265

{header}
    <title>Error</title>
    <description>Error</description>
    <item>
      <title>Error</title>
      <description>{error|escape}</description>
      <guid>https://mercurial-scm.org/#error</guid>
    </item>
  </channel>
</rss>