[css-cascade] Fix linking error.

Author: fantasai

css-cascade-3/Overview.bs

@@ -53,7 +53,7 @@ Introduction</h2>
 	Properties values are assigned to various parts of the document
 	via [=property declarations=],
 	which assign the property a value
-	(e.g. ''red'', ''12pt'', ''dotted'')
+	(e.g. ''red'', ''12pt'', ''border-style/dotted'')
 	for the associated element or box.
 
 	One of the fundamental design principles of CSS is <a lt="cascade">cascading</a>,

css-cascade-4/Overview.bs

@@ -54,7 +54,7 @@ Introduction</h2>
 	Properties values are assigned to various parts of the document
 	via [=property declarations=],
 	which assign the property a value
-	(e.g. ''red'', ''12pt'', ''dotted'')
+	(e.g. ''red'', ''12pt'', ''border/dotted'')
 	for the associated element or box.
 
 	One of the fundamental design principles of CSS is <a lt="cascade">cascading</a>,

css-cascade-5/Overview.bs

@@ -21,7 +21,6 @@ Informative Classes: ex
 <pre class=link-defaults>
 spec:css-syntax-3; type:dfn; text:css identifier
 spec:dom; type:dfn; text:shadow tree
-spec:css-backgrounds-3; type:value; for:border-style; text:dotted
 spec:css-color-4; type:property; text:color
 spec:css-values-3; type: value; text:ex
 spec:css-conditional-3; type:at-rule; text:@media
@@ -51,7 +50,7 @@ Introduction</h2>
 	Properties values are assigned to various parts of the document
 	via [=property declarations=],
 	which assign the property a value
-	(e.g. ''red'', ''12pt'', ''dotted'')
+	(e.g. ''red'', ''12pt'', ''border-style/dotted'')
 	for the associated element or box.
 
 	One of the fundamental design principles of CSS is <a lt="cascade">cascading</a>,