[css3-conditional] Quotes

[svgeesus]

from https://lists.w3.org/Archives/Public/www-style/2016Jan/0059.html raised by Jens Oliver Meiert

Minor minor minor again. The CSS Conditional Rules draft [1] uses
quotation marks inconsistently, that is it makes use of both double
and single quotes, and faux and typographic quotes. (If there is a
rule to mark keywords and such with single quotes, I’m not sure it’s
useful.)

For all drafts it may make sense to consistently use “typographic”
double quotes, but I don’t want to open that can :)

[1] https://drafts.csswg.org/css-conditional/

[svgeesus]

from https://lists.w3.org/Archives/Public/www-style/2016Jan/0060.html fixed by @dbaron

I fixed the ones that came from the document (rather than material
inserted by the preprocessor) in:
https://hg.csswg.org/drafts/rev/43c79a42c9e3