[css-conditional-4] link to definitions in Fonts 4

Author: svgeesus

css-conditional-4/Overview.bs

@@ -108,13 +108,13 @@ parse error), and that selector doesn't contain
 A CSS processor is considered to
 <dfn export for=CSS id="dfn-support-font-technology">support a font technology</dfn>
 when the text and layout processing engine ingesting
-this CSS text is capable of utilising the specified <<font-technology>>
+this CSS text is capable of utilising the specified [[css-fonts-4#font-technology-definitions]]
 in layout and rendering.
 
 A CSS processor is considered to
 <dfn export for=CSS id="dfn-support-font-format">support a font format</dfn>
 when the text and layout processing engine ingesting
-this CSS text is capable of utilising the specified <<font-format>>
+this CSS text is capable of utilising the specified [[css-fonts-4#font-format-definitions]]
 in layout and rendering.
 
 <h2 id="when-rule">Generalized Conditional Rules: the ''@when'' rule</h2>