Yes, that's the idea. The stable release notes include the relevant items from the beta release notes, so you don't need to read both to know what changed.
That 'relevant items' bit is worth taking seriously though — not everything from beta always makes it into stable. If you're tracking a specific feature, the beta release notes might have details the stable notes skip.
The main things that are skipped are things like bugs introduced in one beta and fixed in the next, where it doesn't make sense to mention to people who only install the stable releases, as it never affected them.
Or, similarly, changes to how new features work after user feedback on the initial implementation, where only the final result ends up in the stable release notes.
There may be some other cases as well, but those are the main ones.