Update Android intents documentation about redirects

[estark37]

Per https://bugs.chromium.org/p/chromium/issues/detail?id=814721, it has been the case for a long time that redirects from a typed-in URL will in fact launch intents. We don't currently have plans to change this, so this commit updates the documentation accordingly.

[estark37]

@Meggin would you be able to review this change (or advise who should review it)? Let me know if you'd like me to cc you on the relevant Chrome bug (it's not publicly visible). Thanks!