[css-anchor-position-1] Fix linking errors

Author: tabatkins

css-anchor-position-1/Overview.bs

@@ -2035,7 +2035,7 @@ and thus trigger special behavior. These <dfn>fallback-sensitive changes</dfn> i
 		have been added, removed, or mutated.
 
 	For this purpose, only changes to the <dfn>computed base style</dfn> are considered,
-	i.e. the [=computed style=] ignoring any declarations originating
+	i.e. the [=computed value=] ignoring any declarations originating
 	from the Transitions or Animations [=cascade origins=].
 
 <h5 id="last-successful-recording">
@@ -2300,6 +2300,10 @@ depending on some commonly needed layout conditions.
 	rather than <em>also</em> floating in a nonsensical location.
 </div>
 
+User agents may recognize <css>anchors-valid</css> and <css>anchors-visible</css>
+as [=legacy value aliases=] of ''anchor-valid'' and ''anchor-visible''
+(but are not required to).
+
 <!-- Big Text: anim
 
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