docs: Fix docstring typos, add missing docs groups, and document platform purge() #777

Job	Run time
PR title check	3s
Checks / Integration tests (3.14, ubuntu-latest)	4m 17s
Checks / Package check	17s
Checks / Spell check	9s
Checks / E2E tests (3.11, ubuntu-latest)	5m 30s
Checks / Type check / Type check (3.12)	12s
Checks / Actions lint check	32s
Checks / Type check / Type check (3.13)	10s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.13)	1m 2s
Checks / Type check / Type check (3.11)	10s
Checks / Lint check / Lint check (3.12)	11s
Checks / Type check / Type check (3.14)	10s
Checks / Unit tests / Unit tests (windows-latest, 3.14)	1m 36s
Checks / Unit tests / Unit tests (windows-latest, 3.13)	1m 44s
Checks / E2E tests (3.14, ubuntu-latest)	4m 46s
Checks / Integration tests (3.11, ubuntu-latest)	3m 41s
Checks / Lint check / Lint check (3.14)	10s
Checks / Unit tests / Unit tests (windows-latest, 3.11)	1m 30s
Checks / Unit tests / Unit tests (windows-latest, 3.12)	1m 23s
Checks / Doc check / Docs check	1m 1s
Checks / Lint check / Lint check (3.11)	9s
Checks / Lint check / Lint check (3.13)	12s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.11)	59s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.14)	1m 0s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.12)	1m 8s
	32m 2s

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