RFR: 8357000: Write overview documentation for start of release changes

Tue May 20 04:58:30 UTC 2025

On Tue, 20 May 2025 04:30:57 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> First attempt to populate "supplementary docs" with a discussion of the start of release changes. For reference on the idea of supplementary docs, see the thread
> 
> "Where to put supplementary docs?" https://mail.openjdk.org/pipermail/jdk-dev/2025-April/009975.html

This PR is intended to document current practices. As initially sent out, it discusses changes under `/src`, but not changes under `/test` (most changes are under `/src`).

The PR is _not_ an invitation to re-architect or brainstorm how the start of releases changes could be restructured.

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PR Comment: https://git.openjdk.org/jdk/pull/25317#issuecomment-2892908175