Updates to release-notes.md:
- Write an introduction explaining how to use
release-notes.mdas a template for the release notes draft wiki for collaborative editing at https://github.com/bitcoin-core/bitcoin-devwiki/wiki, as seen for the 0.17.0 and 0.18.0 releases.
Updates to release-process.md:
Create a release notes draft wiki at https://github.com/bitcoin-core/bitcoin-devwiki/wiki.
As per http://www.erisian.com.au/bitcoin-core-dev/log-2019-03-28.html#l-342, for the period during which the release notes are being edited on the wiki, the version on the branch should be wiped and replaced with a link to the wiki which should be used for all announcements until final.
Before -final, remove the "Needs release note" label from relevant PRs/issues and merge the release notes from the wiki into the branch.
Create a pinned meta-issue dedicated to testing the release candidate and communicate it in release announcements where useful. The former is done in practice (e.g. #15555, #14902) and the latter addresses the discussion here yesterday: https://x0f.org/web/statuses/101753569204220416.
Reorganise the headers in the Branch Updates section.
Update the version numbers in the examples.
Adapt and merge in the updates in #15692.