Mention that worker kills child processes on systems supporting prctl. PR_SET_PDEATHSIG

[matusvalo]

Checklist

• I have checked the issues list
  for similar or identical bug reports.
• I have checked the pull requests list
  for existing proposed fixes.
• I have checked the commit log
  to find out if the bug was already fixed in the master branch.
• I have included all related issues and possible duplicate issues in this issue
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Related Issues and Possible Duplicates

Related Issues

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Possible Duplicates

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Description

Documentation https://docs.celeryproject.org/en/master/userguide/workers.html#stopping-the-worker is outdated due merged PR #6942.

Suggestions

Documentation should mention that Celery worker main process running on systems supporting prctl. PR_SET_PDEATHSIG should be able to kill all child processes using SIGKILL signal.

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[auvipy]

i should have suggest the document change in the PR which i forgot!

[matusvalo]

Yeah I will try to update the docs ASAP. It's not big deal just few sentences needs to be added/updated. I have added this bug just for visibility.