[css-text-4] Remove more issues.

Author: fantasai

css-text-4/Overview.bs

@@ -39,8 +39,6 @@ White Space Processing</h2>
 <h3 id="white-space-collapsing">
 White Space Collapsing: the 'text-space-collapse' property</h3>
 
-	<p class="issue">This section is still under discussion and may change in future drafts.</p>
-
 	<pre class="propdef">
 	Name: text-space-collapse
 	Value: collapse | discard | preserve | preserve-breaks | preserve-spaces
@@ -106,8 +104,6 @@ White Space Collapsing: the 'text-space-collapse' property</h3>
 		</pre>
 	</div>
 
-	<p class="issue">This section is still under discussion and may change in future drafts.</p>
-
 <h3 id="white-space-trim">
 White Space Trimming: the 'text-space-trim' property</h3>