Review Request 61965: Moved `--zk_session_timeout` flag docs to the common flags section.

[Ilya Pronin]

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Review request for mesos and Jiang Yan Xu.


Bugs: MESOS-7895
    https://issues.apache.org/jira/browse/MESOS-7895


Repository: mesos


Description
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Mesos agents now accept this flag.


Diffs
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  docs/configuration.md 9cadf0f7559a3aeba3f35477e8f7eac67d3fa5cf 


Diff: https://reviews.apache.org/r/61965/diff/1/


Testing
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N/A


Thanks,

Ilya Pronin