docs: clean up unreleased changelog section for v3.0.0 #492

Job	Run time
PR title check	4s
Docstrings checks / Docstrings checks	15s
Tests / Integration tests (3.11, ubuntu-latest)	2m 24s
Code checks / Actions lint check	29s
Code checks / Spell check	6s
Tests / Integration tests (3.14, ubuntu-latest)	2m 57s
Doc checks / Doc checks / Docs check	1m 22s
Code checks / Lint check / Lint check (3.12)	10s
Code checks / Lint check / Lint check (3.14)	11s
Code checks / Lint check / Lint check (3.13)	13s
Code checks / Type check / Type check (3.13)	14s
Code checks / Type check / Type check (3.12)	13s
Code checks / Lint check / Lint check (3.11)	9s
Code checks / Type check / Type check (3.14)	14s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 0s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	40s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	34s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 20s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	40s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	37s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	54s
Code checks / Type check / Type check (3.11)	12s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 50s
	16m 48s

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