Are there changelogs for gcc point releases? gcc.gnu.org has a 'changes' link but it is actually a 8->9 changelog, rather than 9.2->9.3
The ChangeLog file is in the source code distribution. But the point releases mainly have a large number of bug fixes, there are no new features.
Yup. If you look at the end of the 'changes' link[1] you'll see individual bugzilla links for issues (or PRs as they call them) that were resolved in a given point release.