docs: document rpc api versioning process.#2901

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dnldd wants to merge 3 commits intodecred:masterfrom dnldd:document_rpc_api_versioning

+358

Commits on Mar 17, 2022

docs: document rpc api versioning process.
dnldd
committed

Commits on Mar 18, 2022

resolve review issues (1 of x).
dnldd
committed

Commits on Mar 24, 2022

docs: add websocket versioning.
dnldd
committed