tests/test-gendoc-fr.t

cmdutil: say that `graft --stop` stops the graft instead of aborting

I am going to add a --abort flag to graft soon, so we make sure we differentiate
between the what --stop flag does and what --abort does and don't use the words
interchangeably.

Differential Revision: https://phab.mercurial-scm.org/D3735

#require docutils gettext

  $ $TESTDIR/check-gendoc fr
  checking for parse errors