[css-variables][css-extensions] Use <declaration-value> instead.

Author: tabatkins

css-extensions/Overview.bs

@@ -157,7 +157,7 @@ Custom Properties</h2>
 		<pre>
 		@custom-property --foo {
 			scope: [ inherit | local ];
-			initial: <<any-value>>*;
+			initial: <<declaration-value>>*;
 			value: <<length>> <<length>> <<color>>;
 			/* Literally, define a simplistic definition syntax.
 			   OR FULL CSS PROPERTY GRAMMAR?!? */

css-variables/Overview.bs

@@ -54,7 +54,7 @@ Defining Custom Properties: the '--*' family of properties</h2>
 
 	<pre class='propdef'>
 	Name: --*
-	Value: <<any-value>>
+	Value: <<declaration-value>>
 	Initial: (nothing, see prose)
 	Applies to: all elements
 	Inherited: yes
@@ -128,7 +128,7 @@ Defining Custom Properties: the '--*' family of properties</h2>
 Custom Property Value Syntax</h3>
 
 	The allowed syntax for <a>custom properties</a> is extremely permissive.
-	The <dfn>&lt;any-value></dfn> production matches <em>any</em> sequence of one or more tokens,
+	The <<declaration-value>> production matches <em>any</em> sequence of one or more tokens,
 	so long as the sequence does not contain
 	<<bad-string-token>>,
 	<<bad-url-token>>,
@@ -149,7 +149,7 @@ Custom Property Value Syntax</h3>
 	does not prevent ''!important'' from being used,
 	as the ''!important'' is removed before syntax checking happens.
 
-	Note: While <<any-value>> must represent at least one token,
+	Note: While <<declaration-value>> must represent at least one token,
 	that one token may be whitespace.
 	This implies that ''--foo: ;'' is valid,
 	and the corresponding ''var(--foo)'' call would have a single space as its substitution value,
@@ -382,7 +382,7 @@ Using Cascading Variables: the ''var()'' notation</h2>
 	The syntax of ''var()'' is:
 
 	<pre class='prod'>
-	<dfn>var()</dfn> = var( <<custom-property-name>> [, <<any-value>> ]? )
+	<dfn>var()</dfn> = var( <<custom-property-name>> [, <<declaration-value>> ]? )
 	</pre>
 
 	The ''var()'' function can be used in place of any part of a value in any property on an element.