Replace non-ASCII punctuation (broke syntax before)

[addiment]

Certain CSS snippets were broken due to using unicode special characters, specifically the unicode-range property of the @font-face at-rule. The schema had some inconsistencies in using special characters and regular ASCII, so I replaced those instances with their respective ASCII counterparts.

• Replaced U+201C/201D (left/right double quotation marks “ ”) with U+0022 (quotation mark ")
• Replaced U+2018/2019 (left/right single quotation marks ‘ ’) with U+0027 (apostrophe ')
• Replaced U+2013 (en dash –) with U+002D (hyphen-minus -)

While the ASCII swap on quotation marks and parenthesis is mostly preference, the unicode hyphens don't work when used in the browser, which I believe warrants the change. From the W3C CSS fonts specification:

If the next code point in text is U+002D HYPHEN-MINUS (-), consume it. Otherwise, this is an invalid \<urange>, and this algorithm must exit.

4.5. Character range: the 'unicode-range' descriptor 7.1. The \<urange> type

[addiment]

@microsoft-github-policy-service agree

[addiment]

any maintainers want to check this? @aeschli

[addiment]

Resolved the merge conflict (wasn't much to do), can I get another review?

[addiment]

Gonna mention since this might get lost in notification hell otherwise @sandy081

[aeschli]

Thanks @addiment!