[css-inline-3] Fix typo <#5180 (comment)>

Author: fantasai

css-inline-3/Overview.bs

@@ -673,7 +673,7 @@ Transverse Box Alignment: the 'vertical-align' property</h3>
 	when 'align-content' is ''align-content/normal''.
 	Specifically, ''vertical-align/top'' (''baseline-shift: top'') maps it to ''align-content/start'',
 	''vertical-align/bottom'' (''baseline-shift: bottom'')  to ''align-content/end'',
-	and ''vertical-align/center'' (''alignment-baseline: middle'') to ''align-content/center''.
+	and ''vertical-align/middle'' (''alignment-baseline: middle'') to ''align-content/center''.
 	See [[css-align-3#distribution-block]].
 
 	ISSUE(5234): Define mapping of ''alignment-baseline: middle; baseline-shift: top''.