[css-text-4] Editorial clarification

Author: frivoal

css-text-4/Overview.bs

@@ -10511,7 +10511,7 @@ CJK Punctuation Spacing: the 'text-spacing-trim' property</h3>
 			<details class="note">
 				<summary>This value exists for compat requirements.</summary>
 
-				This value exists to manage formatting of existing Chinese and Japanese content,
+				This value exists to manage formatting of some existing Chinese and Japanese content,
 				for which ''trim-auto'' would have been appropriate typographically,
 				except that they are already written
 				to expect the first line to be set as for ''space-all''.