BUG #17149: About --skip option of pg_amcheck command

The following bug has been logged on the website:

Bug reference: 17149
Logged by: Chen Jiaoqian
Email address: chenjq(dot)jy(at)fujitsu(dot)com
PostgreSQL version: 14beta3
Operating system: Red Hat Enterprise Linux Server release 7.8
Description:

Hi, Author

In PG14 beta3, when I use pg_amcheck command and specify the value of
the option --skip as "none", "all-visible" or "all-frozen", an error
occurs.
The official website is described as follows:
> --skip=option
> If all-frozen is given, table corruption checks will skip over pages
in all tables that are marked as all frozen.
> If all-visible is given, table corruption checks will skip over
pages in all tables that are marked as all visible.
> By default, no pages are skipped. This can be specified as none, but
since this is the default, it need not be mentioned.

When I specify the "none" value for --skip option, the following error
occurs:
[postgres14(at)localhost ~]$ pg_amcheck -p 51403 -d postgres -t tb01
--skip=none
pg_amcheck: error: invalid argument for option --skip
[postgres14(at)localhost ~]$

When I specify the "all-visible" or "all-frozen" value for --skip
option, take "all-visible" as an example, the following error occurs:
[postgres14(at)localhost ~]$ pg_amcheck -p 51403 -d postgres -t tb01
--skip=all-visible
2021-08-16 04:59:04.571 EDT [4689] ERROR: invalid skip option
2021-08-16 04:59:04.571 EDT [4689] HINT: Valid skip options are
"all-visible", "all-frozen", and "none".
2021-08-16 04:59:04.571 EDT [4689] STATEMENT: SELECT blkno, offnum,
attnum, msg FROM "public".verify_heapam(
relation := 16396, on_error_stop := false, check_toast :=
true, skip := 'all visible')
heap table "postgres"."public"."tb01":
ERROR: invalid skip option
HINT: Valid skip options are "all-visible", "all-frozen", and
"none".
[postgres14(at)localhost ~]$

Regards.