[FLINK-23129][docs] Document ApplicationMode limitations

[rmetzger]

Cancelling one of multiple running jobs in AppMode is not properly supported.

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Last check on commit 63b4d23 (Thu Jun 24 13:16:30 UTC 2021)

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• 05a59e1 Azure: FAILURE

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[nicoweidner]

I find this a bit unclear, since finishing a job is not an active action triggered by the user. What do you think of something along the lines of "Regular job completions (by the sources shutting down) are supported."?

[rmetzger]

Thanks a lot for your review. I addressed all your comments.