[[preventSilentAccess]] seems incorrect

[emlun]

The section §5.1.6. Preventing Silent Access to an Existing Credential - PublicKeyCredential’s [[preventSilentAccess]](credential, sameOriginWithAncestors) Method describes preventSilentAccess as an internal method of Credential, but it is in fact a public method of CredentialsContainer. As such, I don't think this belongs as a subsection of §5.1. PublicKeyCredential Interface, because there is no preventSilentAccess() method in the interface - it's on the navigator.credentials object.

The section was added in PR #758, in response to issue #565. I think it does makes sense to keep the mention that the method has no effect on WebAuthn credentials. Maybe we could move that to the end of §5.1. PublicKeyCredential Interface, where we describe some other relations to the Credential supertype?

§5.1. PublicKeyCredential Interface
[...]
PublicKeyCredential's interface object inherits Credential's implementation of [[CollectFromCredentialStore]](origin, options, sameOriginWithAncestors), and defines its own implementation of [[Create]](origin, options, sameOriginWithAncestors), [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors), and [[Store]](credential, sameOriginWithAncestors).

[emlun]

@selfissued Any thoughts on this?

[emlun]

Fixed by #1991.