[css-align] copy/paste error

Author: tabatkins

css-align/Overview.bs

@@ -670,7 +670,7 @@ Baseline Content-Alignment</h3>
 			and its computed 'align-self' is ''align-self/stretch'' or ''self-start'' (''self-end'').
 			For this purpose,
 			the ''start'', ''end'', ''flex-start'', and ''flex-end'' values of 'align-self'
-			are treated as either ''start'' or ''end'',
+			are treated as either ''self-start'' or ''self-end'',
 			whichever they end up equivalent to.
 
 		<dt>Grid Items: