docs: clean up unreleased changelog section for v3.0.0 #582

Job	Run time
PR title check	3s
Docstrings checks / Docstrings checks	11s
Code checks / Spell check	6s
Tests / Integration tests (3.14, ubuntu-latest)	2m 28s
Tests / Integration tests (3.11, ubuntu-latest)	2m 20s
Code checks / Actions lint check	30s
Doc checks / Doc checks / Docs check	1m 10s
Code checks / Type check / Type check (3.14)	13s
Code checks / Type check / Type check (3.13)	11s
Code checks / Type check / Type check (3.12)	11s
Code checks / Lint check / Lint check (3.14)	12s
Code checks / Lint check / Lint check (3.11)	11s
Code checks / Lint check / Lint check (3.13)	11s
Code checks / Type check / Type check (3.11)	11s
Code checks / Lint check / Lint check (3.12)	12s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 2s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	48s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 6s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	47s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	38s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	53s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	38s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	54s
	15m 6s

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