docs: clean up unreleased changelog section for v3.0.0 #600

Job	Run time
PR title check	3s
Tests / Integration tests (3.14, ubuntu-latest)	2m 22s
Docstrings checks / Docstrings checks	10s
Tests / Integration tests (3.11, ubuntu-latest)	2m 36s
Code checks / Spell check	6s
Doc checks / Doc checks / Docs check	55s
Code checks / Actions lint check	30s
Code checks / Type check / Type check (3.11)	13s
Code checks / Type check / Type check (3.12)	10s
Code checks / Lint check / Lint check (3.13)	13s
Code checks / Lint check / Lint check (3.11)	12s
Code checks / Type check / Type check (3.14)	9s
Code checks / Type check / Type check (3.13)	18s
Code checks / Lint check / Lint check (3.14)	14s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	41s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 5s
Code checks / Lint check / Lint check (3.12)	10s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 19s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 8s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	45s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 13s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	47s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	47s
	16m 6s

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