[FLINK-15684][docs][bp-1.10] Add taskmanager.memory.flink.size to common options

[dawidwys]

What is the purpose of the change

Add taskmanager.memory.flink.size to common options.

Backport of #10916

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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Last check on commit d318d59 (Tue Jan 21 12:53:18 UTC 2020)

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[tillrohrmann]

Thanks for creating this PR @dawidwys. LGTM. +1 for merging after resolving the only comment.

[tillrohrmann]

I would put the reference to flink.size at the end of the description similar to what we are doing in the description of TOTAL_FLINK_MEMORY.

[dawidwys]

Closing it. Will backport manually after addressing comment.