[S02] fix description of the anonymous enum function

Author: felher

S02-bits.pod

@@ -4756,7 +4756,7 @@ in which the key is the inner C<Pair>:
 =head2 The anonymous C<enum> function
 
 The anonymous C<enum> function takes a list of keys or pairs, and adds
-values to any keys that are not already part of a key.  The value added
+values to any keys that are not already part of a pair.  The value added
 is one more than the previous key or pair's value.  This works nicely with
 the new C<qq:ww> form: