[FLINK-12020] [Deployment/Mesos/Documentation] Add documentation for mesos-appmaster-job.sh

[yinchuanwang]

1. Rename the section title from standalone to Flink session cluster on Mesos.
2. Add one new section Flink job cluster on Mesos which describes the usage of mesos-appmaster-job.sh.

What is the purpose of the change

This pull request adds the documentation for mesos-appmaster-job.sh.

Brief change log

• Rename the existing section title from 'standalone' to 'Flink session cluster on Mesos' to be consistent with its content.
• Add one new section 'Flink job cluster on Mesos' to describe the usage of mesos-appmaster-job.sh.

Verifying this change

This change is a trivial documentation enhancement without any test coverage.

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

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no

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[tillrohrmann]

Thanks a lot for the update of the documentation @yinchuanwang. LGTM. Merging.