[css-text-4] Simplify phrasing in changelog

Author: frivoal

css-text-4/Overview.bs

@@ -10561,7 +10561,7 @@ Additions Since Level 3</h3>
 	* 'word-boundary-detection', for automatically detecting word boundaries (at risk)
 	* 'word-boundary-expansion', for transforming word separators
 	* breaking up of the 'white-space' property into multiple longhands:
-		* 'white-space-collapse' longhand (of the longstanding 'white-space' property) and its ''preserve-spaces'' and ''white-space-collapse/discard'' values
+		* 'white-space-collapse' and its ''preserve-spaces'' and ''white-space-collapse/discard'' values
 		* 'white-space-trim', for trimming excess white space at the boundaries of an element
 		* 'text-wrap-mode' to control whether wrapping occurs or not
 	* 'text-wrap-style' and its ''balance'', ''stable'', and ''pretty'' values