p6 is a bit unwieldy ... should we split it up into bullets?

It was always a big wall of text with two notes and an example in the middle, but our new way of putting those on a new line makes it look like it should really be separate paragraphs, or at least bulleted, or something.

Also, the new sentence added by P1169R4 static operator() seems like it's not really part of that paragraph, should it be split into a separate paragraph? With the current formatting it looks like it's only applicable to the last "sub-paragraph" of p6, about derived-to-base conversions, but it's not.