[css-images-4][css-shapes-2][editorial] Fetching an image/shape requires a declaration block (#12889)

Author: cdoublev

css-images-4/Overview.bs

@@ -148,7 +148,7 @@ Fetching External Images {#fetching-images}
 -------------------------------------------
 
 	To <dfn export>fetch an external image for a stylesheet</dfn>,
-	given a <<url>> |url| and a [=CSS style declaration=] |declaration|,
+	given a <<url>> |url| and a [=CSS declaration block=] |declaration|,
 	[=fetch a style resource=] given |url|,
 	with ruleOrDeclaration being |declaration|,
 	destination "image",

css-shapes-2/Overview.bs

@@ -189,7 +189,7 @@ Shapes from Image</h3>
 Fetching external shapes</h2>
 
 	To <dfn>fetch an external resource for a shape</dfn>, either an SVG or an image, given a
-		[=CSS style declaration=] |declaration|,
+		[=CSS declaration block=] |declaration|,
 		[=fetch a style resource=] given a <<url>> value,
 		with ruleOrDeclaration being |declaration|,
 		destination "image",