docs: document v3 error subclasses, fix pagination, flag internal modules #649

Job	Run time
PR title check	5s
Docstrings checks / Docstrings checks	10s
Code checks / Actions lint check	34s
Tests / Integration tests (3.11, ubuntu-latest)	2m 48s
Code checks / Spell check	8s
Tests / Integration tests (3.14, ubuntu-latest)	2m 36s
Code checks / Lint check / Lint check (3.12)	9s
Code checks / Lint check / Lint check (3.11)	9s
Code checks / Lint check / Lint check (3.13)	9s
Package check / Package check	17s
Doc checks / Doc checks / Docs check	1m 8s
Code checks / Type check / Type check (3.13)	11s
Code checks / Lint check / Lint check (3.14)	11s
Code checks / Type check / Type check (3.12)	12s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	46s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	47s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 5s
Code checks / Type check / Type check (3.11)	9s
Code checks / Type check / Type check (3.14)	10s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 9s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	47s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	46s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 7s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 18s
	16m 51s

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