docs: clean up unreleased changelog section for v3.0.0 #656

Job	Run time
PR title check	4s
Code checks / Actions lint check	29s
Tests / Integration tests (3.11, ubuntu-latest)	2m 23s
Package check / Package check	17s
Docstrings checks / Docstrings checks	15s
Code checks / Spell check	4s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	42s
Code checks / Type check / Type check (3.13)	19s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 8s
Code checks / Type check / Type check (3.14)	18s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 6s
Code checks / Type check / Type check (3.12)	14s
Tests / Integration tests (3.14, ubuntu-latest)	2m 29s
Doc checks / Doc checks / Docs check	1m 0s
Code checks / Lint check / Lint check (3.14)	12s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	52s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 19s
Code checks / Lint check / Lint check (3.11)	13s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	48s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 3s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	45s
Code checks / Lint check / Lint check (3.12)	9s
Code checks / Lint check / Lint check (3.13)	10s
Code checks / Type check / Type check (3.11)	15s
	16m 34s

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