[css-align] Fix leftover text that required writing-mode matching to alignment context. w3c#425

Author: fantasai

css-align/Overview.bs

@@ -1274,15 +1274,14 @@ Baseline Self-Alignment</h3>
 		<dt>Flex Items:
 		<dd>
 			A <a>flex item</a> participates in first (last) <a>baseline self-alignment</a> in its flex line
-			if its <a>inline axis</a> is parallel to the <a>main axis</a>
-			and its computed 'align-self' is ''first baseline'' (''last baseline'').
+			if its computed 'align-self' is ''first baseline'' (''last baseline'').
 			See [[!CSS-FLEXBOX-1]] for details.
 
 		<dt>Grid Items:
 		<dd>
 			A <a>grid item</a> participates in first (last) <a>baseline self-alignment</a>
-			in either its row or column (whichever matches its <a>inline axis</a>)
-			if its 'justify-self' or 'align-self' property (whichever affects its <a>block axis</a>)
+			in its row or column
+			if its 'align-self' or 'justify-self' property (respectively)
 			computes to ''first baseline'' (''last baseline'').
 	</dl>