[css-text] Update test info

Author: frivoal

css-text-3/Overview.bs

@@ -966,6 +966,7 @@ Text Processing</h3>
       white-space/control-chars-007.html
       white-space/control-chars-008.html
       white-space/control-chars-00B.html
+      white-space/control-chars-00C.html
       white-space/control-chars-00D.html
       white-space/control-chars-00E.html
       white-space/control-chars-00F.html

css-text-3/test-coverage.html

@@ -156,15 +156,9 @@ <h2 id="white-space-processing-details"><a href="https://drafts.csswg.org/css-te
 <p>Missing tests:
 
 <ul>
-	<li>Form feeds (U+000C) (that are not segment breaks) are rendered as a zero-width space (U+200B).
 	<li>As required by [UNICODE], unsupported Default_ignorable characters must be ignored for rendering.
 </ul>
 
-<p>Tests that need to be updated:
-<ul>
-	<li>update to match the resolution in <a href="https://github.com/w3c/csswg-drafts/issues/855">Issue 855</a>
-</ul>
-
 <h3 id="the-white-space-processing-rules">The <a href="https://drafts.csswg.org/css-text-3/#white-space-rules">White Space Processing Rules</a></h3>
 
 <p>Sufficient coverage. All parts of this section are well exercised.