Remove additional whitespace (#12456)

Author: keithamus

css-align-3/Overview.bs

@@ -974,7 +974,7 @@ The 'justify-content' and 'align-content' Properties</h3>
 
 	<pre class="propdef">
 	Name: align-content
-	Value: normal | <<baseline-position>> |  <<content-distribution>> | <<overflow-position>>? <<content-position>>
+	Value: normal | <<baseline-position>> | <<content-distribution>> | <<overflow-position>>? <<content-position>>
 	Initial: normal
 	Applies to: block containers, multicol containers, flex containers, and grid containers
 	Inherited: no