[css-pseudo-4] Reword to avoid broken link

Author: fantasai

css-pseudo-4/Overview.bs

@@ -865,9 +865,9 @@ Cascading and Per-Element Highlight Styles</h3>
   its [=specified value=] is determined by inheritance from
   the corresponding <a>highlight pseudo-element</a>
   of its <a>originating element</a>'s parent element.
-  This occurs regardless of whether that property is an <a>inherited property</a>,
-  including [=registered custom properties=] where the [=inherits descriptor=] is false.
-
+  This occurs regardless of whether that property is an <a>inherited property</a>
+  (and regardless of whether that property is a [=custom property=]
+  that is registered to [=CSS/inherit=] or not).
   Additionally,
   for [=highlight pseudo-elements=] originating from the root element,
   the [=inherited value=] of 'color'