mercurial/templates/raw/search.tmpl

doc: wrap the help text for the purge extension

Not sure why `black` or some other checker didn't complain about this.

Differential Revision: https://phab.mercurial-scm.org/D11036

{header}
# HG changesets search
# Node ID {node}
# Query "{query}"
# Mode {modedesc}

{entries%changelogentry}