docs: basic authentication sends the password unasked

Review 4, 1269's note: the node challenges for a password (`WWW-Authenticate`) only
what isn't a browser, by `Sec-Fetch-*` or a `Mozilla/…` user agent. A client calling
itself Mozilla that waits for a challenge before sending its password would get none:
api.md says to send the password with the request, as `curl -u` does, and why.

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