Review Request 38325: mesos: Add high-level description to persistent volume docs.

[Neil Conway]

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https://reviews.apache.org/r/38325/
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Review request for mesos.


Repository: mesos


Description
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This text is shamelessly copied from Adam B's answer here:

    https://stackoverflow.com/a/28493909


Diffs
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  docs/persistent-volume.md b5dd6d8ec68d8ed7dd4787ffc9973bbe6c49965a 

Diff: https://reviews.apache.org/r/38325/diff/


Testing
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Thanks,

Neil Conway