Re: [csswg-drafts] [css-pseudo] Clarify spec text in "Finding the First Formatted Line" section

FYI, Firefox doesn't support applying first-letter/line inside descendant blocks yet ([bug 214004](https://bugzilla.mozilla.org/show_bug.cgi?id=214004)), so for the given example the entire `<DIV>` contents is wrapped in a ::first-line pseudo.  Given the limitations of our existing implementation, the rendering makes sense, i.e. it renders exactly the same as:
```html
<style>span { color: cyan; background: magenta; }</style>
<div><span><p style="display: inline-block">Hello<br>Goodbye</p> etcetera</span></div>
```

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