docs(ionicons): logo icons different from rest

[janpio]

http://ionicframework.com/docs/ionicons/

If you search for something, you can normally always use the value from the "Name" column as the name of ion-icon: <ion-icon name="star"></ion-icon>.

This doesn't work for e.g. "twitter" or "twitch" where you have to use logo-twitter which is only visible after clicking the icon to get the popup.

This might be confusing (I know it was to me).

[beck24]

This caught me a couple of days ago...

[ciaran036]

This definitely needs to be documented. Something as simple as this shouldn't be left for us to scour Ionic forum posts for an answer for.

[leksinteractive]

I got tripped up on this one today as well.

I had a look at what's involved in updating the docs, setup this repo locally, ran gulp watch but then got stuck. Would it be just a matter of updating the icon 'keys' in this configuration file:

https://github.com/ionic-team/ionic-site/blob/master/content/docs/ionicons/site_data.json

Happy to update it if I could get some guidance?