Make polar-angle animatable as an angle (ACTION-709: https://www.w3.org/Style/CSS/Tracker/actions/709)(2)

Author: hyojinLGE

css-round-display/Overview.bs

@@ -298,7 +298,7 @@ The 'polar-angle' property specifies the angle from the X-axis (or a fixed direc
     Media: visual
     Inherited: no
     Percentages: n/a
-	Animatable: as <angle>
+	Animatable: &lt;angle>
 </pre>
 <h3 id="polar-distance-property">The 'polar-distance' property</h3>
 The 'polar-distance' property specifies the distance from the center of the parent (or a fixed point).