[css-anchor-position] Make anchor()/anchor-size() keywords in the first arg reorderable. w3c#10317

Author: tabatkins

css-anchor-position-1/Overview.bs

@@ -720,7 +720,7 @@ The ''anchor()'' function resolves to a <<length>>.
 It is only valid to be used in the [=inset properties=].
 
 <pre class=prod>
-	&lt;anchor()> = anchor( <<anchor-element>>? <<anchor-side>>, <<length-percentage>>? )
+	&lt;anchor()> = anchor( <<anchor-element>>? && <<anchor-side>>, <<length-percentage>>? )
 	<dfn><<anchor-element>></dfn> = <<dashed-ident>>
 	<dfn><<anchor-side>></dfn> = inside | outside
 			   | top | left | right | bottom
@@ -1244,7 +1244,7 @@ The ''anchor-size()'' Function {#anchor-size-fn}
 ------------------------------
 
 <pre class=prod>
-anchor-size() = anchor-size( <<anchor-element>>? <<anchor-size>>, <<length-percentage>>? )
+anchor-size() = anchor-size( <<anchor-element>>? && <<anchor-size>>, <<length-percentage>>? )
 <dfn><<anchor-size>></dfn> = width | height | block | inline | self-block | self-inline
 </pre>