markup typo

Author: tabatkins

css-syntax/Overview.bs

@@ -3217,7 +3217,7 @@ Style rules</h3>
 	or whose value does not match the syntax defined by the property are invalid
 	and must be ignored.
 	The validity of the style rule’s contents have no effect on the validity of the style rule itself.
-	Unless otherwise specified, property names are <i>ASCII case-insensitive</i>.
+	Unless otherwise specified, property names are <a>ASCII case-insensitive</a>.
 
 	Note: The names of Custom Properties [[CSS-VARIABLES]] are case-sensitive.