[Mellanox] add document for thermal control related cli#832

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liat-grozovik merged 3 commits intosonic-net:masterfrom Junchao-Mellanox:thermal-cli-doc

Mar 17, 2020

+80

Commits on Mar 2, 2020

[Mellanox] add document for thermal control related cli
Junchao-Mellanox
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Update review comments thermal zones -> thermal sensors
Junchao-Mellanox
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Commits on Mar 11, 2020

Make example better
Junchao-Mellanox
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