[css-images-4][editorial] Fix Bikeshed errors.

Author: tabatkins

css-images-4/Overview.bs

@@ -11,7 +11,7 @@ Editor: Tab Atkins Jr., Google, http://xanthir.com/contact/, w3cid 42199
 Editor: Elika J. Etemad / fantasai, Invited Expert, http://fantasai.inkedblade.net/contact, w3cid 35400
 Editor: Lea Verou, Invited Expert, http://lea.verou.me/about, w3cid 52258
 Abstract: This module contains the features of CSS level 4 relating to the <<image>> type and replaced elements.
-	It includes and extends the functionality of CSS level 2 [[CSS21]] and in the previous level of this specification [[css3-images]].
+	It includes and extends the functionality of CSS level 2 [[CSS2]] and in the previous level of this specification [[css3-images]].
 	The main extensions compared to "CSS Images Module Level 3" [[css3-images]] are several additions to the <<image>> type, such as the ''image()'' notation, the ''element()'' notation, and conic gradients.
 
 Issue Tracking: Tracker http://www.w3.org/Style/CSS/Tracker/products/27
@@ -74,7 +74,7 @@ Value Definitions {#values}
 	<pre class="prod"><dfn>&lt;image></dfn> = <<url>> | <<image()>> | <<image-set()>> | <<cross-fade()>> | <<element()>> | <<gradient>></pre>
 
 	An <<image>> can be used in many CSS properties,
-	including the 'background-image', 'list-style-image', 'cursor' properties [[!CSS21]]
+	including the 'background-image', 'list-style-image', 'cursor' properties [[!CSS2]]
 	(where it replaces the <<url>> component in the property's value).
 
 	In some cases an image is invalid,
@@ -333,7 +333,7 @@ Image Fallbacks and Annotations: the ''image()'' notation {#image-notation}
 	A <<string>> used in ''image()'' represents a <<url>>.
 	As usual for URLs in CSS,
 	relative URLs are resolved to an absolute URL
-	(as described in Values &amp; Units [[!css-values-3]])
+	(as described in Values &amp; Units [[!CSS-VALUES-3]])
 	when a specified ''image()'' value is computed.
 
 	If the image has an orientation specified in its metadata,
@@ -1266,7 +1266,7 @@ Conic Gradients: the ''conic-gradient()'' notation</h3>
 		<dd>
 			Determines the <dfn dfn export>gradient center</dfn> of the gradient.
 			The <<position>> value type (which is also used for 'background-position')
-			is defined in [[css-values-3]],
+			is defined in [[CSS-VALUES-3]],
 			and is resolved using the center-point as the object area
 			and the <a>gradient box</a> as the positioning area.
 			If this argument is omitted, it defaults to ''background-position/center''.