[css-text-4] Remove leftover issue.

Author: fantasai

css-text-4/Overview.bs

@@ -52,8 +52,6 @@ White Space Collapsing: the 'text-space-collapse' property</h3>
 	Media: visual
 	</pre>
 
-	<p class="issue">Need a property name</p>
-
 	This property declares whether and how
 	<a href="#white-space-processing">white space</a> inside the element is
 	collapsed. Values have the following meanings, which must be interpreted