[css-align-3] Fix definition of 'normal' to match css-grid-1.

Author: fantasai

css-align-3/Overview.bs

@@ -1460,9 +1460,9 @@ Inline-Axis (or Main-Axis) Alignment: the 'justify-self' property</h3>
 		<tr>
 			<th>''justify-self/normal'' Behavior
 			<td>
-				Effectively ''justify-self/stretch'' for items with no intrinsic aspect ratio,
-				and ''justify-self/start'' for items with an intrinsic aspect ratio:
-				see <a href="https://www.w3.org/TR/css-grid-1/#grid-item-sizing">Grid Item Sizing</a> in [[!CSS-GRID-1]].
+				Effectively ''justify-self/start'' for most [=replaced elements=]
+				and ''justify-self/stretch'' for most [=non-replaced elements=];
+				see <a href="https://www.w3.org/TR/css-grid-1/#grid-item-sizing">Grid Item Sizing</a> in [[!CSS-GRID-1]] for precise behavior.
 				The resulting box is start-aligned.
 	</table>