docs: document v3 error subclasses, fix pagination, flag internal mod… #194

Job	Run time
Docstrings checks / Docstrings checks	14s
Code checks / Actions lint check	28s
Doc checks / Doc checks / Docs check	1m 8s
Code checks / Spell check	6s
Code checks / Type check / Type check (3.13)	14s
Code checks / Type check / Type check (3.12)	12s
Code checks / Lint check / Lint check (3.13)	10s
Code checks / Lint check / Lint check (3.11)	13s
Code checks / Lint check / Lint check (3.12)	14s
Code checks / Type check / Type check (3.14)	13s
Code checks / Type check / Type check (3.11)	9s
Code checks / Lint check / Lint check (3.14)	9s
Tests	-5s
Beta release	0s
Doc release / Release docs	1m 51s
	5m 16s

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