[css-page-floats] remove exaple with pull quotes, as that requires 2D floating, updateoutput of example 19 to be in line with the spec

Author: johanneswilm

css-page-floats/Overview.bs

@@ -836,7 +836,7 @@ img {
 
   </div>
 
-  <div class="example">
+  <!--div class="example">
     Pull quotes are often centered in a column. In this example, the pull quote is
     floated to the right, and then pushed back into the center.
 
@@ -850,7 +850,7 @@ img {
 }
 </pre>
 
-  </div>
+  </div-->
 
 
 <h2 id="page-float-placement">Page float placement</h2>