[css-writing-mode] Use a better link for HTML section reference

Author: frivoal

css-writing-modes-3/Overview.bs

@@ -209,7 +209,7 @@ Inline Direction and Bidirectionality</h2>
     to its corresponding CSS styles.
 
   <p class="note">
-    The HTML specifications ([[HTML401]], section 8.2, and [[HTML]] [[HTML#bidi-rendering|section 14.3.5]]) define
+    The HTML specifications ([[HTML401]], section 8.2, and [[HTML]] [[HTML/rendering.html#bidi-rendering|section 14.3.5]]) define
     bidirectionality behavior for HTML elements.</p>
 
   <p class="advisement">

css-writing-modes-4/Overview.bs

@@ -208,7 +208,7 @@ Inline Direction and Bidirectionality</h2>
     to its corresponding CSS styles.
 
   <p class="note">
-    The HTML specifications ([[HTML401]], section 8.2, and [[HTML]] [[HTML#bidi-rendering|section 14.3.5]]) define
+    The HTML specifications ([[HTML401]], section 8.2, and [[HTML]] [[HTML/rendering.html#bidi-rendering|section 14.3.5]]) define
     bidirectionality behavior for HTML elements.</p>
 
   <p class="advisement">