[css-grid] 'in-flow' is too specific, doesn't handle floats correctly. Intended term is probably non-replaced. Fixes #1734.

Author: fantasai

css-grid/Overview.bs

@@ -893,7 +893,7 @@ Sizing Grid Containers</h3>
 		<li>
 			As a block-level box in a <a>block formatting context</a>,
 			it is sized like a block box that establishes a formatting context,
-			with an ''auto'' <a>inline size</a> calculated as for in-flow block boxes.
+			with an ''auto'' <a>inline size</a> calculated as for non-replaced block boxes.
 		<li>
 			As an inline-level box in an <a>inline formatting context</a>,
 			it is sized as an atomic inline-level box (such as an inline-block).