docs: document v3 error subclasses, fix pagination, flag internal modules #648

Job	Run time
Doc checks / Doc checks / Docs check	56s
Code checks / Actions lint check	33s
Tests / Integration tests (3.14, ubuntu-latest)	2m 29s
Code checks / Spell check	5s
Package check / Package check	20s
Docstrings checks / Docstrings checks	13s
PR title check	6s
Tests / Integration tests (3.11, ubuntu-latest)	2m 18s
Code checks / Lint check / Lint check (3.11)	12s
Code checks / Type check / Type check (3.11)	14s
Code checks / Lint check / Lint check (3.13)	11s
Code checks / Type check / Type check (3.13)	13s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	46s
Code checks / Type check / Type check (3.14)	12s
Code checks / Lint check / Lint check (3.12)	9s
Code checks / Lint check / Lint check (3.14)	14s
Code checks / Type check / Type check (3.12)	11s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	45s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 5s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 9s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 13s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	46s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	42s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 57s
	16m 59s

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