docs: clean up unreleased changelog section for v3.0.0 #642

Job	Run time
PR title check	4s
Code checks / Actions lint check	30s
Code checks / Spell check	5s
Package check / Package check	19s
Tests / Integration tests (3.11, ubuntu-latest)	2m 21s
Docstrings checks / Docstrings checks	11s
Doc checks / Doc checks / Docs check	1m 5s
Tests / Integration tests (3.14, ubuntu-latest)	2m 36s
Code checks / Type check / Type check (3.13)	10s
Code checks / Type check / Type check (3.12)	13s
Code checks / Lint check / Lint check (3.11)	11s
Code checks / Lint check / Lint check (3.13)	9s
Code checks / Lint check / Lint check (3.14)	15s
Code checks / Type check / Type check (3.11)	14s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	47s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	43s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 10s
Code checks / Lint check / Lint check (3.12)	14s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	46s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 3s
Code checks / Type check / Type check (3.14)	10s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 6s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 4s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	46s
	16m 12s

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