Commit 
fc0438b4e80 added the ii_WithoutOverlaps field, but the comment
was not updated.
Author: Japin Li <japinli@hotmail.com>
Reviewed-by: Richard Guo <guofenglinux@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/ME0P300MB04453E6C7EA635F0ECF41BFCB6832%40ME0P300MB0445.AUSP300.PROD.OUTLOOK.COM
  *     IndexUnchanged      aminsert hint, cached for retail inserts
  *     Concurrent          are we doing a concurrent index build?
  *     BrokenHotChain      did we detect any broken HOT chains?
+ *     WithoutOverlaps     is it a WITHOUT OVERLAPS index?
  *     Summarizing         is it a summarizing index?
  *     ParallelWorkers     # of workers requested (excludes leader)
  *     Am                  Oid of index AM