Remove the #1390 inline issue.

Author: tabatkins

css-display/Overview.bs

@@ -615,10 +615,6 @@ Automatic Box Type Transformations</h3>
 	its [=inner display type=] converts to ''flow''
 	so that it becomes a <a>block container</a>.
 
-	Issue: Should conversion of layout-internal display types also happen for inlinification?
-	If it does, should it change to ''flow'' or ''flow-root''?
-	If it doesn't, then anonymous-box fixup will handle things.
-
 	The root element’s display type is always <a>blockified</a>.
 	Additionally, a 'display' of ''display/contents'' computes to ''block'' on the root element.