[css-values-5][css-variables-1] Fix links

Author: fantasai

css-variables-1/Overview.bs

@@ -87,7 +87,7 @@ Value Definitions</h3>
 Defining Custom Properties: the '--*' family of properties</h2>
 
 	This specification defines an open-ended set of properties called <a>custom properties</a>,
-	which, among other things, are used to define the [=substitute|substitution value=] of ''var()'' functions.
+	which, among other things, are used to define the [=arbitrary substitution|substitution value=] of ''var()'' functions.
 
 	<pre class='propdef'>
 	Name: --*
@@ -1025,7 +1025,7 @@ As such, there are no new privacy considerations.
 Security Considerations {#security}
 ===============================================
 
-[[#long-substitution]] calls out a long-standing Denial-of-Service attack
+[[css-values-5#long-substitution]] calls out a long-standing Denial-of-Service attack
 that can be mounted against "macro-expansion"-like mechanisms,
 such as the ''var()'' function,
 and mandates a defense against that attack.
@@ -1040,4 +1040,6 @@ variables-animation-math-functions.html
 
 <!-- unrelated to this specification; random bugs etc -->
 variable-recalc-with-initial.html
-</wpt>
+</wpt>
+
+<wpt-rest></wpt-rest>