docs: clean up unreleased changelog section for v3.0.0 #491

Job	Run time
PR title check	3s
Docstrings checks / Docstrings checks	11s
Tests / Integration tests (3.14, ubuntu-latest)	2m 52s
Code checks / Actions lint check	29s
Tests / Integration tests (3.11, ubuntu-latest)	2m 1s
Code checks / Spell check	4s
Doc checks / Doc checks / Docs check	1m 27s
Code checks / Lint check / Lint check (3.11)	10s
Code checks / Lint check / Lint check (3.12)	9s
Code checks / Lint check / Lint check (3.14)	12s
Code checks / Lint check / Lint check (3.13)	16s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	40s
Code checks / Type check / Type check (3.12)	12s
Code checks / Type check / Type check (3.13)	11s
Code checks / Type check / Type check (3.14)	11s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 4s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 1s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 3s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	38s
Code checks / Type check / Type check (3.11)	13s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	40s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 9s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	38s
	15m 34s

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