Re: [webcomponents] Update Section 6.2 Focus Navigation to reflect TPAC discussion (#375)

Right, we want `#first` -> `#last` for the former and `#last` -> `#first` for the latter.

We're definitely not defining a nested browsing context because that'd be a wrong semantics.  The reason I bring that up is that we need some sort of grouping/scoping mechanism for each shadow root as well as each slot (e.g. if tabindex was set on `#first` and `#last`, that shouldn't affect the order by which they're tab-focused).  Since the HTML5 spec currently treats elements in each nested browsing context as if it were in such a scope, my point is that we should refactor the spec to extract that concept and make browsing context use it instead of the focus navigation section directly referring to browsing context.  I've already asked @hober to do this and it looks like @LjWatson made https://github.com/w3c/html/issues/44 to track this.

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