rebase: delete unused p1 argument to _concludenode()
Unused since a0192a03216d (rebase: remove now unnecessary logic to
allow empty commit when branch changes, 2020-07-09).
Differential Revision: https://phab.mercurial-scm.org/D9055
#require docutils gettext
Error: the current ro localization has some rst defects exposed by
moving pager to core. These two warnings about references are expected
until the localization is corrected.
$ $TESTDIR/check-gendoc ro
checking for parse errors
gendoc.txt:58: (WARNING/2) Inline interpreted text or phrase reference start-string without end-string.
gendoc.txt:58: (WARNING/2) Inline interpreted text or phrase reference start-string without end-string.