[DOCS] Alternative nomenclature for "Master" and "Minion"

[joncwong]

Description
Seeking alternative nomenclature in efforts of diversity/belonging.

Suggested Fix
Does the community have any guidelines for those that wish to rebrand their own SaltStack usage or future plans to rename "Master" or "Minion"?

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[OrangeDog]

Discussion is here: saltstack/salt-enhancement-proposals#37
They will be replaced at some point.
It appears that "master" will become "controller".