[css-fonts-4] correct bib link for AAT features

Author: svgeesus

css-fonts-4/Overview.bs

@@ -1874,7 +1874,7 @@ The <dfn id="at-font-face-rule">''@font-face''</dfn> rule</h3>
 
     The 'features' requirement refers to support for font features,
     commonly implemented in [[!OPENTYPE]] with the <code>GSUB</code> and the <code>GPOS</code> tables,
-    as well as in [[!AAT]] using the <code>morx</code> table.
+    as well as in [[!AAT-FEATURES]] using the <code>morx</code> table.
     The section on [[#font-rend-props]] describes properties that interact with these facilities.
 
     The 'variations' requirement refers to the support of font variations,