[DOC] high-level explanation of deprecation policy principles #6364
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This PR adds a preamble to the "deprecation policy" document in the developer guide, explaining why we need a deprecation policy, and high-level principles from which the policy elements are derived.
This should hopefully provide a better degree of illustration and explanation to new developers that we onboard.
A review by new developers (e.g., summer mentees) is especially welcome, as this is written for you.