Document how resp is affected by raising `HTTPError`/`HTTPStatus` about falcon HOT 3 OPEN

TBD: do we need any code changes here, or is clearly documenting the current behaviour good enough?

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Clear documentation would be sufficient for my needs, personally, but mainly because I still want to send cookies along with redirects. I could also see an argument for the redirects using a completely new response, though, because it’s two lines to explicitly send a redirect while maintaining the response otherwise (set the status, set the header).

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If we were to implement #1752 also for http status/error it would be feasible to add an attribute to them called override_request that means "discard everything in request and use things only from this object".

The default would be False to keep the current behaviour

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