D3825: grep: deprecates `--all` flag

[pulkit (Pulkit Goyal)]

pulkit added inline comments.

INLINE COMMENTS

> commands.py:2446
>      a non-match, or "+" for a non-match that becomes a match), use the
>      --diff/--all flag.
>  

Drop the mention of `--all` flag from here.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3825

To: sangeet259, #hg-reviewers
Cc: pulkit, yuja, mercurial-devel