doc/release-notes: another batch of release note edits (#310538)
* Another batch of release not edits
* Elide mention of dub lockfiles
Co-authored-by: Weijia Wang <9713184+wegank@users.noreply.github.com>
* Qualify qtmultimedia with qt6
Co-authored-by: Weijia Wang <9713184+wegank@users.noreply.github.com>
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Co-authored-by: Weijia Wang <9713184+wegank@users.noreply.github.com>
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