[css-text-3] Avoid contradiction about the effects of hanging on intrinsic sizing

Part of #4267

Author: frivoal

css-text-3/Overview.bs

@@ -873,12 +873,11 @@ Text Processing</h3>
 
   <p>[=White space=] that was not removed or collapsed due to white space processing
     is called <dfn export local-lt="preserved">preserved white space</dfn>.
-    In general, <a>preserved white space</a> is measured when calculating
-    the intrinsic sizes ([=min-content size=] and [=max-content size=]) of text;
-    however <a>preserved white space</a>
-    that would <a>hang</a> when at the end of the line
-    (i.e. that preserved by ''pre-wrap'')
-    is excluded.
+
+    Note: In some cases,
+    [=preserved white space=] and [=other space separators=]
+    can <a>hang</a> when at the end of the line;
+    this can affect whether they are measured for [=intrinsic sizing=].
 
   <p>The following informative table summarizes the behavior of various
     'white-space' values:</p>