[css-cascade][editorial] Correctly reference cascade origin w3c#6670

Author: mirisuzanne

css-cascade-3/Overview.bs

@@ -181,7 +181,7 @@ Processing Stylesheet Imports</h3>
 	it is perfectly appropriate for a UA to fetch a style sheet only once,
 	even though it's linked or imported multiple times.
 
-	The URL [=url/origin=] of an imported style sheet is the URL [=url/origin=] of the style sheet that imported it.
+	The [=cascade origin=] of an imported style sheet is the [=cascade origin=] of the style sheet that imported it.
 
 	The <a>environment encoding</a> of an imported style sheet is the encoding of the style sheet that imported it. [[css-syntax-3]]
 

css-cascade-4/Overview.bs

@@ -260,7 +260,7 @@ Processing Stylesheet Imports</h3>
 	it is perfectly appropriate for a UA to fetch a style sheet only once,
 	even though it's linked or imported multiple times.
 
-	The URL [=url/origin=] of an imported style sheet is the URL [=url/origin=] of the style sheet that imported it.
+	The [=cascade origin=] of an imported style sheet is the [=cascade origin=] of the style sheet that imported it.
 
 	The <a>environment encoding</a> of an imported style sheet is the encoding of the style sheet that imported it. [[css-syntax-3]]
 

css-cascade-5/Overview.bs

@@ -257,7 +257,7 @@ Processing Stylesheet Imports</h3>
 	it is perfectly appropriate for a UA to fetch a style sheet only once,
 	even though it's linked or imported multiple times.
 
-	The URL [=url/origin=] of an imported style sheet is the URL [=url/origin=] of the style sheet that imported it.
+	The [=cascade origin=] of an imported style sheet is the [=cascade origin=] of the style sheet that imported it.
 
 	The <a>environment encoding</a> of an imported style sheet is the encoding of the style sheet that imported it. [[css-syntax-3]]