Backport PR #29442 on branch v3.10.0-doc (DOC: put section headings in 3.10 what's new) - #29445

Backport PR #29442 on branch v3.10.0-doc (DOC: put section headings in 3.10 what's new)#29445

tacaswell merged 1 commit into

matplotlib:v3.10.0-docmatplotlib/matplotlib:v3.10.0-docfrom

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