[webauthn] Merged Pull Request: fix broken {{PublicKeyCredentialEntity/id}} links to be..

equalsJeffH has just merged equalsJeffH's pull request 728 for https://github.com/w3c/webauthn:

== fix broken {{PublicKeyCredentialEntity/id}} links to be.. ==
..{{PublicKeyCredentialRpEntity/id}}

fixes #727


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See https://github.com/w3c/webauthn/pull/728