[css-grid] Reword the grid-auto-flow:none issue with more detail.

Author: tabatkins

css-grid/Overview.html

@@ -1458,11 +1458,11 @@ <h3 data-level=6.2 id=grid-auto-flow-property><span class=secno>6.2 </span><span
 <p class=note>	Note: A future level of this module is expected to add a value that flows auto-positioned items together into a single “default” cell.
 
 	<p class=issue>
-		While we want the functionality of <a class=css data-link-type=maybe href=#valuedef-none0>none</a>,
-		the specifics defined here aren't great
-		(they're for compat with current IE behavior).
-		Is it possible to still make <a class=css data-link-type=maybe href=#valuedef-rows>rows</a> the default,
-		and maybe figure out a way to make the default position determined by the auto-placement algorithm?
+		IE compat apparently requires the <a data-link-for=grid-auto-flow data-link-type=value href=#valuedef-none>none</a> value,
+		but it's not a very good value.
+		Can we perhaps just have that be an IE-specific value set in the UA stylesheet?
+		Change our value to <span class=css data-link-type=maybe>stack</span>
+		and let <a class=property data-link-type=propdesc href=#propdef-grid-auto-position title=grid-auto-position>grid-auto-position</a> accept <code>rows | columns</code> instead to mean "use the auto-placement algorithm".
 
 	<p>
 		Auto-placement takes <a href=#grid-item>grid items</a> in <a class=property data-link-type=propdesc href=http://dev.w3.org/csswg/css-flexbox-1/#order title=order>order</a>-modified document order.

css-grid/Overview.src.html

@@ -1447,11 +1447,11 @@ <h3 id="grid-auto-flow-property">
 	Note: A future level of this module is expected to add a value that flows auto-positioned items together into a single “default” cell.
 
 	<p class='issue'>
-		While we want the functionality of ''none'',
-		the specifics defined here aren't great
-		(they're for compat with current IE behavior).
-		Is it possible to still make ''rows'' the default,
-		and maybe figure out a way to make the default position determined by the auto-placement algorithm?
+		IE compat apparently requires the <a value for=grid-auto-flow>none</a> value,
+		but it's not a very good value.
+		Can we perhaps just have that be an IE-specific value set in the UA stylesheet?
+		Change our value to ''stack''
+		and let 'grid-auto-position' accept <code>rows | columns</code> instead to mean "use the auto-placement algorithm".
 
 	<p>
 		Auto-placement takes <a>grid items</a> in 'order'-modified document order.