[css-text-4] Bugfix, initial value of text-space-trim is none

Author: frivoal

css-text-4/Overview.bs

@@ -109,7 +109,7 @@ White Space Trimming: the 'text-space-trim' property</h3>
 	<pre class="propdef">
 	Name: text-space-trim
 	Value: none | trim-inner || discard-before || discard-after
-	Initial: collapse
+	Initial: none
 	Applies to: all elements
 	Inherited: no
 	Percentages: n/a