Add additional whitespace (w3c#12457)

Author: keithamus

css-fonts-4/Overview.bs

@@ -7196,7 +7196,7 @@ Low-level font variation settings control: the 'font-variation-settings' propert
 
 <pre class="propdef">
 Name: font-variation-settings
-Value: normal | [ <<opentype-tag>> <<number>>]#
+Value: normal | [ <<opentype-tag>> <<number>> ]#
 Initial: normal
 Applies to: all elements and text
 Inherited: yes