This chanage enabled codespell in precommit and
fixes the existing typos.
A followup commit will enable this in tox and ci.
Change-Id: I0a11bcd5a88247a48d3437525fc8a3cb3cdd4e58
Add the releasenote for the general purpose decision engine threadpool.
Including config parameters and how contributors can find relevant
documentation.
Implements: blueprint general-purpose-decision-engine-threadpool
Change-Id: I3560069b4e34f13305950559a0f05f7921f7867e