[css-grid] Remove issue about auto-placement algo, as it seems to be addressed.

Author: tabatkins

css-grid/Overview.bs

@@ -1751,8 +1751,6 @@ Automatic Grid Item Placement Algorithm</h4>
 			reset the <a>auto-placement cursor</a> to 1/1 each time an item is placed.
 	</ol>
 
-	<p class="issue">Review this wrt concerns in <a href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=16044">bug 16044</a>.
-
 <h2 id='grid-shorthand'>
 Grid Definition Shorthand: the 'grid' property</h2>