[css-fonts-4] correct ref for <color>

Author: svgeesus

css-fonts-4/Overview.bs

@@ -21,6 +21,7 @@ Ignored Terms: font-palette, <named-palette-color>
 
 <pre class="link-defaults">
 spec:css-color-4; type:property; text:color
+spec: css-color-4; type: type; text: <color>
 spec:css-values; type:value; text:ex
 spec:css22; type:value; for:/; text:block
 spec:html; type:element; text:font