[css-linke-params] Remove mentions of scoped environment vars.

Author: tabatkins

css-link-params-1/Overview.bs

@@ -186,7 +186,7 @@ as in a URL's query parameters.
 <div class="example">
 	For example, if the image from the previous example also used ''env(--bg-color)'',
 	it could be referenced with a url like
-	“<code>http://example.com/image.svg#param(--text-color,blue)&param(--bg-color,white)</code>”
+	“<code>http://example.com/image.svg#param(--text-color,blue)&amp;param(--bg-color,white)</code>”
 	to set both ''env(--text-color)'' and ''env(--bg-color)''.
 </div>
 
@@ -262,31 +262,23 @@ accessible with the ''env()'' function in stylesheets.
 	1. On each ''env()'' function, provide a fallback value, like ''fill: env(--color, blue)''.
 	2. If the ''env()'' is going to be used a lot,
 		such that providing a fallback for each individual ''env()'' is troublesome,
-		store the [=custom environment variable=] in a [=scoped environment variable=]
-		of a different name,
+		store the [=custom environment variable=] in a [=custom property=] on the root element
 		with the default specified,
 		like:
 
 		<pre class="lang-css">
-			@env --color2: env(--color, blue);
-
-			/* Alternately, store it in a custom property: */
 			:root {
 				--color: env(--color, blue);
 			}
 		</pre>
 
 		In this example, if ''--color'' is provided via a [=linked parameter=],
-		''env(--color2)'' will contain its value.
+		''var(--color)'' will contain its value.
 		If not, it will contain the default ''blue'' value.
-		In either case, ''env(--color2)'' can be used in the stylesheet unconditionally,
+		In either case, ''var(--color)'' can be used in the stylesheet unconditionally,
 		secure in the knowledge that it will always have a value.
 </div>
 
-Note: When we define ''env(parent --color)'' to jump up a scope level,
-you won't need to do the rename;
-''@env --color: env(parent --color);'' will work just fine.
-
 
 <h2 class="no-num no-ref" id=priv>
 Privacy Considerations</h2>