[css-position-3] Fix inline/block mixup wrt ratio-dependent axis.

Author: fantasai

css-position-3/Overview.bs

@@ -891,7 +891,7 @@ Automatic Sizes of Absolutely-Positioned Boxes</h3>
 	When both axes have an [=automatic size=],
 	if only one axis has an ''inset/auto'' inset
 	then that axis is the [=ratio-dependent=] axis,
-	else the [=inline axis=] is the [=ratio-dependent=] axis.
+	else the [=block axis=] is the [=ratio-dependent=] axis.
 	An [=automatic size=] in the [=ratio-determining=] axis
 	is determined as above.