docs: clean up unreleased changelog section for v3.0.0 #644

Job	Run time
Package check / Package check	17s
Tests / Integration tests (3.14, ubuntu-latest)	2m 33s
Tests / Integration tests (3.11, ubuntu-latest)	2m 31s
PR title check	3s
Code checks / Actions lint check	33s
Docstrings checks / Docstrings checks	12s
Code checks / Spell check	5s
Code checks / Lint check / Lint check (3.13)	11s
Code checks / Lint check / Lint check (3.14)	11s
Code checks / Lint check / Lint check (3.11)	9s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 18s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 3s
Code checks / Type check / Type check (3.12)	15s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 9s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	41s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	49s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	52s
Code checks / Type check / Type check (3.14)	12s
Code checks / Type check / Type check (3.13)	12s
Code checks / Lint check / Lint check (3.12)	16s
Doc checks / Doc checks / Docs check	1m 1s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 5s
Code checks / Type check / Type check (3.11)	13s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	43s
	16m 34s

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