Re: [webauthn] Refine makeCredential description

[Incorporate feedback from JeffH, part 
1](https://github.com/w3c/webauthn/pull/369/commits/64455164f7881d198d8a9d14534a3107e6feca54)
  - LGTM

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Received on Thursday, 2 March 2017 22:32:26 UTC