[css-animations-2] Bikeshed fixup

Author: fantasai

css-animations-2/Overview.bs

@@ -548,21 +548,23 @@ with the timelines matched up with animations as described
 Each value has type <<single-animation-timeline>>, whose possible values have
 the following effects:
 
-:   <dfn for="<single-animation-timeline>" dfn-type=value>auto</dfn>
+<dl dfn-for="animation-timeline,<single-animation-timeline>" dfn-type=value>
+:   <dfn>auto</dfn>
 ::  The animation's [=timeline=] is a {{DocumentTimeline}}, more specifically
     the <a>default document timeline</a>.
 
-:   <dfn for="<single-animation-timeline>" dfn-type=value>none</dfn>
+:   <dfn>none</dfn>
 ::  The animation is not associated with a [=timeline=].
 
-:   <dfn>&lt;timeline-name></dfn>
+:   <dfn><<timeline-name>></dfn>
 ::  Find the last timeline at-rule in document order with its name matching
     <<timeline-name>>. If such a timeline at-rule exists, then the animation's
     [=timeline=] is a timeline as defined by that rule. Otherwise the animation
     is not associated with a [=timeline=].
     <pre class=prod>
-      &lt;timeline-name> = <<custom-ident>> | <<string>>
+      <<timeline-name>> = <<custom-ident>> | <<string>>
     </pre>
+</dl>
 
 
 Issue: Make it easier to use 'animation-name' to select the timeline when