Re: [csswg-drafts] "Applies to: all elements" should mean the property applies to ::before and ::after (#1861)

Added a dfn for “applies to” to css-cascade, and added a note about what “all elements” means wrt pseudo-elements. This gives us an anchor to point at.

@tabatkins Thinking about also adding 

> (When a property does not [=apply to|apply=], this means it has no formatting effect on that box or element.)

to css-cascade, but debating a bit whether to add it in parentheses or not, and whether to add it before or after the flex example. Thoughts?

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