Re: [webauthn] explain challenge's security importance and use in both registration and authentication operations

`atob()` returns a DOMString rather than an ArrayBuffer. 
```js
Uint8Array.from(window.atob("PGifxAoBwCkWkm4b1CiIl5otCphiIh6MijdjbWFjomA="), c=>c.charCodeAt(0))
```
would work.

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Received on Friday, 14 April 2017 21:30:05 UTC