[css-animations-2][editorial] A single animation-delay value resets animation-delay-end (#14336)

Author: cdoublev

css-animations-2/Overview.bs

@@ -601,8 +601,8 @@ as described in [[#animations]].
   The 'animation-delay' property is a [=shorthand property|shorthand=]
   that sets 'animation-delay-start' and 'animation-delay-end'
   together in a single declaration. Specifying a single value will
-  set the 'animation-delay-start' to that value, and will not affect
-  the  value of 'animation-delay-end', for backward compatibility with
+  set the 'animation-delay-start' to that value, and will reset
+  'animation-delay-end' to its initial value, for backward compatibility with
   the 'animation-delay' previous longhand behavior.
 
 ## The 'animation-fill-mode' property ## {#animation-fill-mode}