D3678: graft: correct documentation about options can be reapplied

[yuja (Yuya Nishihara)]

yuja added a comment.


  >   About this change in help, I am going to drop this note completely in https://phab.mercurial-scm.org/D3667 once --continue reapplies all the previous flags.
  
  Cool, thanks.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3678

To: khanchi97, #hg-reviewers, av6
Cc: pulkit, yuja, mercurial-devel