[css-values-4] Rename fetch() to src(), per WG resolution. Closes w3c#541.

Author: tabatkins

css-values-4/Overview.bs

@@ -712,11 +712,11 @@ Resource Locators: the <<url>> type</h3>
 	which is a pointer to a resource.
 
 	Typically, a <<url>> is written with the <dfn>url()</dfn>
-	or <dfn>fetch()</dfn> <a>functional notations</a>:
+	or <dfn>src()</dfn> <a>functional notations</a>:
 
 	<pre class="prod">
 		<dfn id="url-value">&lt;url></dfn> = url( <<string>> <<url-modifier>>* ) |
-		        fetch( <<string>> <<url-modifier>>* )
+		        src( <<string>> <<url-modifier>>* )
 	</pre>
 
 	<div class="example">
@@ -731,7 +731,7 @@ Resource Locators: the <<url>> type</h3>
 	in which case it is <a lt="consume a url token" spec=css-syntax-3>specially-parsed</a>
 	as a <<url-token>> [[!CSS-SYNTAX-3]].
 	Because of this special parsing, ''url()'' is only able to specify its URL literally;
-	''fetch()'' lacks this special parsing rule,
+	''src()'' lacks this special parsing rule,
 	and so its URL can be provided by functions,
 	such as ''var()''.
 
@@ -746,9 +746,9 @@ Resource Locators: the <<url>> type</h3>
 		And these have the same meaning as well:
 
 		<pre>
-			background: fetch("http://www.example.com/pinkish.gif");
+			background: src("http://www.example.com/pinkish.gif");
 			--foo: "http://www.example.com/pinkish.gif";
-			background: fetch(var(--foo));
+			background: src(var(--foo));
 		</pre>
 
 		But this does <em>not</em> work: