[css-text] Update test coverage info

Author: frivoal

css-text-3/Overview.bs

@@ -776,6 +776,7 @@ Text Processing</h3>
         white-space/white-space-pre-wrap-trailing-spaces-003.html
         white-space/white-space-pre-wrap-trailing-spaces-004.html
         white-space/white-space-pre-wrap-trailing-spaces-005.html
+        white-space/trailing-other-space-separators-002.html
         white-space/pre-wrap-tab-001.html
         white-space/pre-wrap-tab-002.html
         white-space/pre-wrap-tab-003.html
@@ -1580,6 +1581,7 @@ Text Processing</h3>
           white-space/pre-wrap-float-001.html
           white-space/trailing-ideographic-space-001.html
           white-space/trailing-ideographic-space-002.html
+          white-space/trailing-other-space-separators-001.html
           white-space/trailing-space-before-br-001.html
         </wpt>
         <wpt pathprefix="/css/CSS2/text/">
@@ -1637,6 +1639,7 @@ Text Processing</h3>
                white-space/white-space-intrinsic-size-004.html
                white-space/pre-wrap-tab-005.html
                white-space/pre-wrap-tab-006.html
+               white-space/trailing-other-space-separators-002.html
              </wpt>
 
              Note: [=Hanging=] the white space rather than collapsing it

css-text-3/test-coverage.html

@@ -188,7 +188,6 @@ <h4 id="phase-ii-trimming-and-positioning">4.1.3 <a href="https://drafts.csswg.o
 
 <ul>
 	<li>See [UAX9] for rules on how U+0009 tabulation interacts with bidi.
-	<li>Tests for <a href="https://github.com/w3c/csswg-drafts/issues/3879">https://github.com/w3c/csswg-drafts/issues/3879</a>
 </ul>
 
 <h3 id="tab-character-size-the-tab-size-property">4.2 <a href="https://drafts.csswg.org/css-text-3/#tab-size-property">Tab Character Size: the tab-size property</a></h3>