Added Documentation for Swarm Jobs

[ollypom]

Proposed changes

Swarm Jobs were initially implemented in Docker Engine 20.10, this PR adds the documentation.

moby/moby#40307

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[usha-mandya]

Thanks @ollypom.

@thaJeztah Could you PTAL?

[thaJeztah]

Arf. Started reviewing this, but didn't manage to finish (wanted to have another look to see what it looks like with my suggestions, but let me submit what I have so far 😓)

[ollypom]

Thanks @thaJeztah 😄 I've incorporated your feedback in the latest commit.

[Felixoid]

Is there still something blocking the PR from merge?

[DakotaNelson]

Hey @thaJeztah - hate to bug you but it would be awesome if you were able to take another pass at this. Would help a lot of people (including me!) use this functionality thanks to better docs.

The code was released in early December 2020 but in my searching for how to do this, it took quite a while to realize it's actually supported in swarm natively and just undocumented. ☹️

[hertzg]

A humble ping @thaJeztah would be awesome if we could get this documented and rolling.

Also should we have a separate pr for documenting global-job and repliated-job modes for docker-compose?

[usha-mandya]

Close and reopen PR to trigger build checks

[hertzg]

@usha-mandya Seems like there's some MDL issues and a broken link (htmlproffer) reported by the checks

[docker-robott]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions.
As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment.
If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

Prevent pull requests from auto-closing with a /lifecycle frozen comment.

/lifecycle stale

[guoard]

@thaJeztah PTAL