Removed left over paragraph describing <1d-image> in <image>

Author: SebastianZ

css-images-4/Overview.bs

@@ -1915,12 +1915,6 @@ Color Stop “Fixup”</h4>
 	without defining a <em>direction</em> for the line.
 	The <<1d-image>> type represents such images.
 
-	Some contexts will define how they use the <<1d-image>> as a 1-dimensional value;
-	for example, in 'border-color',
-	the given colors paint "outwards" from each side of the border.
-	When used generically as an <<image>>, a <<1d-image>> is painted identically to a ''linear-gradient(to bottom, ...)''
-	using the [=paint line=] as its [=gradient line=].
-
 	<pre class=prod>
 		<dfn>&lt;1d-image></dfn> = <<stripes()>>
 		<dfn>stripes()</dfn> = stripes( <<color-stripe>># )