docs: clean up unreleased changelog section for v3.0.0 #529

Job	Run time
PR title check	3s
Docstrings checks / Docstrings checks	15s
Tests / Integration tests (3.11, ubuntu-latest)	2m 27s
Tests / Integration tests (3.14, ubuntu-latest)	2m 23s
Code checks / Spell check	8s
Code checks / Actions lint check	29s
Code checks / Type check / Type check (3.11)	10s
Doc checks / Doc checks / Docs check	1m 31s
Code checks / Lint check / Lint check (3.14)	11s
Code checks / Type check / Type check (3.14)	10s
Code checks / Lint check / Lint check (3.13)	13s
Code checks / Type check / Type check (3.12)	10s
Code checks / Lint check / Lint check (3.12)	10s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	34s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 2s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	42s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 2s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	44s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	44s
Code checks / Type check / Type check (3.13)	11s
Code checks / Lint check / Lint check (3.11)	8s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 5s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 8s
	15m 40s

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