[css-values] Fix some WPT errors.

Author: tabatkins

css-values-3/Overview.bs

@@ -1322,7 +1322,7 @@ Absolute Lengths: the ''cm'', ''mm'', ''Q'', ''in'', ''pt'', ''pc'', ''px'' unit
 	Note: Units are [=ASCII case-insensitive=] and serialize as lower case, for example 1Q serializes as 1q.
 
 	<wpt>
-	css/css-values/absolute-length-units.html
+	css/css-values/absolute-length-units-001.html
 	css/css-values/q-unit-case-insensitivity-001.html
 	css/css-values/q-unit-case-insensitivity-002.html
 	css/CSS2/values/units-001.xht

css-values-4/Overview.bs

@@ -1825,7 +1825,7 @@ Absolute Lengths: the ''cm'', ''mm'', ''Q'', ''in'', ''pt'', ''pc'', ''px'' unit
 	Note: Units are [=ASCII case-insensitive=] and serialize as lower case, for example 1Q serializes as 1q.
 
 	<wpt>
-	css/css-values/absolute-length-units.html
+	css/css-values/absolute-length-units-001.html
 	css/css-values/q-unit-case-insensitivity-001.html
 	css/css-values/q-unit-case-insensitivity-002.html
 	css/CSS2/values/units-001.xht