[css-inline-3] Fix incorrect initial value for dominant-baseline. Fixes #4115

Author: fantasai

css-inline-3/Overview.bs

@@ -159,7 +159,7 @@ Dominant Baselines: the 'dominant-baseline' property</h3>
 	<pre class="propdef">
 	Name: dominant-baseline
 	Value: auto | text-bottom | alphabetic | ideographic | middle | central | mathematical | hanging | text-top
-	Initial: normal
+	Initial: auto
 	Applies to: block containers, inline boxes, table rows, table columns, grid containers, and flex containers
 	Inherited: yes
 	Percentages: N/A