[css-text-4] Update test coverage information

Author: frivoal

css-text-4/Overview.bs

@@ -10425,7 +10425,9 @@ CJK Punctuation Spacing: the 'text-spacing-trim' property</h3>
 		* inheritance
 		* animation type
 		* applies to text
-		* tests for trim-auto, trim-start, normal, auto values"></wpt>
+		* tests for end-of-line behavior for all values
+		* tests for start-of-line behavior for all values other than normal and space-first
+		* tests for adjacent pairs for all values other than the initial value"></wpt>
 
 	<pre class="propdef">
 	Name: text-spacing-trim