gh-95913: Prepare remaining Whatsnew sections for editing #98342
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Part of #95913
To ensure PRs to edit the remaining sections can all be submitted in parallel and don't introduce any merge conflicts with each other, this preliminary PR (which can hopefully be merged quickly) ensures there are two line breaks between each section (per standard convention), and adds the same standard ref target labels to each section as the previous to enable stable cross-referencing.
To note, this PR does not do so for any of the
Improved Modules
subsections, which will be done in a separate PR once the current batch of PRs adding/editing those are merged, so the rest can safely proceed in parallel without conflicts.Additionally, it makes a few other straightforward but cross-cutting changes: