Don't define a [[preventSilentAccess]] internal method

Fixes issue #1956.
#1956

index.bs

@@ -1704,6 +1704,9 @@ that are returned to the caller when a new credential is created, or a new asser
 implementation of each of {{PublicKeyCredential/[[Create]](origin, options, sameOriginWithAncestors)}}, {{PublicKeyCredential/[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)}}, and
 {{PublicKeyCredential/[[Store]](credential, sameOriginWithAncestors)}}.
 
+Calling {{CredentialsContainer}}'s {{CredentialsContainer/preventSilentAccess()}} method
+will have no effect on {{PublicKeyCredential}} credentials, since they always require user interaction.
+
 
 ### `CredentialCreationOptions` Dictionary Extension ### {#sctn-credentialcreationoptions-extension}
 
@@ -2766,18 +2769,6 @@ When this method is invoked, the user agent MUST execute the following algorithm
 
 </div>
 
-###  Preventing Silent Access to an Existing Credential - PublicKeyCredential's `[[preventSilentAccess]](credential, sameOriginWithAncestors)` Method ### {#sctn-preventSilentAccessCredential}
-
-<div link-for-hint="PublicKeyCredential/[[preventSilentAccess]](credential, sameOriginWithAncestors)">
-
-Calling the <dfn for="PublicKeyCredential" method>\[[preventSilentAccess]](credential, sameOriginWithAncestors)</dfn> method
-will have no effect on authenticators that require an [=authorization gesture=],
-but setting that flag may potentially exclude authenticators that can operate without user intervention.
-
-This [=internal method=] accepts no arguments.
-
-</div>
-
 ### Availability of [=User-Verifying Platform Authenticator=] - PublicKeyCredential's `isUserVerifyingPlatformAuthenticatorAvailable()` Method ### {#sctn-isUserVerifyingPlatformAuthenticatorAvailable}
 
 <div link-for-hint="WebAuthentication/isUserVerifyingPlatformAuthenticatorAvailable">