Revise individual-transforms description (#1829)

Author: ddbeck

features/individual-transforms.yml

@@ -1,5 +1,5 @@
 name: Individual transform properties
-description: The `translate`, `rotate`, and `scale` CSS properties apply simple transformations independently, as opposed to applying multiple transformations with the `transform` CSS property.
+description: The `translate`, `rotate`, and `scale` CSS properties apply single transformations independently, as opposed to applying multiple transformations with the `transform` CSS property.
 spec: https://drafts.csswg.org/css-transforms-2/#individual-transforms
 group: transforms
 compat_features: