WD-CSS21-20020802 section 7, "Media types", substantive comments

Following is a substantive comment on section 7, "Media types"
(<http://www.w3.org/TR/2002/WD-CSS21-20020802/media.html>), of the
Cascading Style Sheets level 2.1 draft
(<http://www.w3.org/TR/2002/WD-CSS21-20020802>).



7.3 Recognized media types


'Authors should not use pixel units with the "tty" media type.'

Change "pixel" to "'px'".