docs: Add field descriptions to Actor models #849

Job	Run time
PR title check	8s
Checks / Image lint check	5s
Checks / Spell check	5s
Checks / Integration tests (3.11, ubuntu-latest)	2m 38s
Checks / Doc check / Docs check	1m 18s
Checks / Type check / Type check (3.14)	10s
Checks / Docstrings check	21s
Checks / Type check / Type check (3.13)	17s
Checks / Lint check / Lint check (3.13)	11s
Checks / Type check / Type check (3.11)	14s
Checks / Package check	16s
Checks / Lint check / Lint check (3.11)	11s
Checks / Markdown lint check	23s
Checks / Lint check / Lint check (3.12)	13s
Checks / Lint check / Lint check (3.14)	10s
Checks / Unit tests / Unit tests (windows-latest, 3.11)	1m 18s
Checks / Integration tests (3.14, ubuntu-latest)	2m 48s
Checks / Actions lint check	33s
Checks / Unit tests / Unit tests (windows-latest, 3.13)	1m 7s
Checks / Website lint check	23s
Checks / Unit tests / Unit tests (windows-latest, 3.14)	1m 6s
Checks / Type check / Type check (3.12)	18s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.14)	48s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.12)	47s
Checks / Unit tests / Unit tests (windows-latest, 3.12)	1m 13s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.13)	44s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.11)	44s
	18m 29s

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