[css-inline-3] text-orientation: sideways-left is not a thing

https://drafts.csswg.org/css-writing-modes-3/#text-orientation

Author: litherum

css-inline-3/Overview.bs

@@ -192,7 +192,7 @@ Dominant Baselines: the 'dominant-baseline' property</h3>
 		<dd>
 			Equivalent to ''dominant-baseline/alphabetic'' in <a>horizontal writing modes</a>
 			and in <a>vertical writing modes</a>
-			when 'text-orientation' is ''sideways'', ''sideways-right'', or ''sideways-left''.
+			when 'text-orientation' is ''sideways'', or ''sideways-right''.
 			Equivalent to ''dominant-baseline/central'' in <a>vertical writing modes</a>
 			when 'text-orientation' is ''mixed'' or ''upright''.