[css-align-3] Make sure align/justify-self for Grid both have the same note.

Author: tabatkins

css-align-3/Overview.bs

@@ -1654,6 +1654,8 @@ Block-Axis (or Cross-Axis) Alignment: the 'align-self' property</h3>
 				The resulting box is then start-aligned.
 	</table>
 
+	See [[!CSS-GRID-1]] for details.
+
 <h3 id='place-self-property'>
 Self-Alignment Shorthand: the 'place-self' property</h3>