squeeze space [ci skip]

enum.c

@@ -1221,7 +1221,7 @@ sort_by_cmp(const void *ap, const void *bp, void *data)
  *     sorted = Dir["*"].sort_by { |f| test(?M, f) }
  *     sorted   #=> ["mon", "tues", "wed", "thurs"]
  *
- *  To produce the reverse of a specific order, the following can  be used:
+ *  To produce the reverse of a specific order, the following can be used:
  *
  *    ary.sort_by { ... }.reverse!
  */