[css-fonts-4] Users should set user style sheets, rather than UA style sheets

Author: xfq

css-fonts-4/Overview.bs

@@ -783,7 +783,7 @@ The interaction of those nonstandard algorithms with 'font-min-size' or 'font-ma
 
 If the 'font-min-size' property is computed to be larger than the 'font-max-size' property, then the 'font-max-size' property is not used for the purposes of text rendering or rasterization. However, the computed value of 'font-max-size' is not affected.
 
-Users with accessibility preferences can set this in a user-agent style sheet to force websites' text to become larger or smaller.
+Users with accessibility preferences can set this in a <a>user style sheet</a> to force websites' text to become larger or smaller.
 
 The computed value of these two properties affects the computed value of 'font-size'.