Re: [w3c/manifest] Add note on back button requirements (#687)

@dominickng Agree that not all apps need a back button, see https://github.com/w3c/manifest/pull/687/commits/cc01b115278bdbddb1ff15c348445561ff268670.

Also agree that double back buttons are a horrible experience and that user-agent sniffing can't be the answer.

Here's yet another issue for Twitter's desktop PWA ([on Chrome](https://developers.google.com/web/updates/2018/05/dpwa), here running on macOS), notice how it disables the back button based on window width:
 
<img width="610" alt="screen shot 2018-06-05 at 13 29 23" src="https://user-images.githubusercontent.com/145676/40973476-a6c2d018-68c4-11e8-91a5-a61cc24dd1a7.png">

<img width="605" alt="screen shot 2018-06-05 at 13 29 19" src="https://user-images.githubusercontent.com/145676/40973477-a6e2aeec-68c4-11e8-9358-acbf6b63e7e0.png">

I really think more guidance is required.

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Received on Tuesday, 5 June 2018 11:34:34 UTC