[css-inline-3][editorial] Added alias 'ideographic central baseline' to definition of term 'central baseline'

Author: SebastianZ

css-inline-3/Overview.bs

@@ -424,7 +424,7 @@ Baselines and Metrics</h3>
 			the [=line-under=] design edge of CJK (Han/Hangul/Kana) text.
 			Assigned to <code>ideo</code> in OpenType.
 
-		<dt><dfn lt="central baseline" local-lt="central">central</dfn>
+		<dt><dfn lt="central baseline | ideographic central baseline" local-lt="central">central</dfn>
 		<dd>
 			Corresponds to the ideographic central baseline,
 			halfway between the [=ideographic-under=] and [=ideographic-over=] baselines.