[e] (0) Clarify typographic conventions.
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@8230 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 53fee6716f76aefee64117c844d27f06ccaaf045)