Unmatched test and comment in partition_join.sql regression test

I noticed this in the regression test while polishing the PWJ-enhancement patch:

-- partitionwise join can not be applied for a join between list and range
-- partitioned tables
EXPLAIN (COSTS OFF)
SELECT t1.a, t1.c, t2.b, t2.c FROM prt1_n t1 FULL JOIN prt1 t2 ON (t1.c = t2.c);

The test doesn't match the comment which precedes it, because both
tables are range-partitioned as shown below.

\d+ prt1_n
                                  Partitioned table "public.prt1_n"
 Column |       Type        | Collation | Nullable | Default | Storage
 | Stats target | Description
--------+-------------------+-----------+----------+---------+----------+--------------+-------------
 a      | integer           |           |          |         | plain
 |              |
 b      | integer           |           |          |         | plain
 |              |
 c      | character varying |           |          |         |
extended |              |
Partition key: RANGE (c)
Partitions: prt1_n_p1 FOR VALUES FROM ('0000') TO ('0250'),
            prt1_n_p2 FOR VALUES FROM ('0250') TO ('0500')

\d+ prt1
                                   Partitioned table "public.prt1"
 Column |       Type        | Collation | Nullable | Default | Storage
 | Stats target | Description
--------+-------------------+-----------+----------+---------+----------+--------------+-------------
 a      | integer           |           |          |         | plain
 |              |
 b      | integer           |           |          |         | plain
 |              |
 c      | character varying |           |          |         |
extended |              |
Partition key: RANGE (a)
Partitions: prt1_p1 FOR VALUES FROM (0) TO (250),
            prt1_p2 FOR VALUES FROM (250) TO (500),
            prt1_p3 DEFAULT

I think the test should be moved to a more appropriate place, and the
comment should be moved to a test that really performs a join between
list and range partitioned tables.  Attached is a patch for that.  The
patch fixes another misplaced comment as well.

Best regards,
Etsuro Fujita