[css-grid] Drop block-axis baselines per <https://lists.w3.org/Archives/Public/www-style/2016Aug/0053.html> Issue #175

Author: fantasai

css-grid/Overview.bs

@@ -3502,14 +3502,14 @@ Aligning the Grid: the 'justify-content' and 'align-content' properties</h3>
 <h3 id='grid-baselines'>
 Grid Container Baselines</h3>
 
-	The first (last) baselines for each axis of a <a>grid container</a>
+	The first (last) baselines of a <a>grid container</a>
 	are determined as follows:
 
 	<ol>
 		<li>
-			If any of the <a>grid items</a> whose areas intersect the <a>grid container</a>’s first (last) row/column
-			<a href="#baseline-participation">participate in baseline alignment</a>,
-			the grid container's <a>baseline set</a> in that axis
+			If any of the <a>grid items</a> whose areas intersect the <a>grid container</a>’s first (last) row
+			participate in <a>baseline alignment</a>,
+			the grid container's <a>baseline set</a>
 			is <a lt="generate baselines">generated</a> from
 			the shared <a>alignment baseline</a> of those <a>grid items</a>.