Re: [webcomponents] Spec examples need to be updated to use the new syntax (#318)

Yeah, let me do it.

As far as I remember, I tried to update the example in a few weeks ago, but I couldn't do it *mechanically* because the original *scenario* would become unnatural because it requires invasive *slot* attributes being there beforehand, in code example 2, before Bob decides to use shadow DOM. 

It says:
> Bob decides to use shadow DOM. Doing so will allow Bob to keep the document markup uncluttered, 

Unfortunately, slots attributes looks invasive, compared to class attributes.

We need to tweak the Bob's mind to keep the scenario attractive. :(

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