Update docs for tri-state BotShieldEnabled and 403 interstitial #36

Job	Run time
pytest (not browser) + short soak	8m 27s
docs/ is up to date with sources	8s
pytest (browser) — headless Chromium	1m 29s
8h soak (manual)	0s
fuzz (cookie + robots, 30m each, manual)	0s
	10m 4s

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