Clean up wording so we're not defining a thing and then redefining it.

Author: fantasai

css-text-3/Overview.bs

@@ -1019,13 +1019,11 @@ Characters and Letters</h3>
         </li>
       </ol>
     </li>
-    <li><p>If 'white-space' is set to ''pre'', ''pre-wrap'', or ''break-spaces''
-      any sequence of spaces is treated as a sequence of non-breaking spaces.
-      However, a <a>soft wrap opportunity</a> exists at the end of the sequence
-      in the case of ''pre-wrap'' and ''break-spaces'',
-      as well as between every space of the sequence
-      in the case of ''break-spaces''.
-
+    <li><p>If 'white-space' is set to ''pre'' or ''pre-wrap''
+      any sequence of spaces is treated as a sequence of non-breaking spaces;
+      however, a <a>soft wrap opportunity</a> exists at the end of the sequence.
+      In the case of ''break-spaces'',
+      a <a>soft wrap opportunity</a> exists after every space.
       <wpt>
         overflow-wrap/overflow-wrap-break-word-004.html
         overflow-wrap/overflow-wrap-break-word-005.html