Fix status command options in zpool(8)

The 'zpool status' command supports the -P option for printing full
path names.  It does not support the -p parsable option for printing
exact values.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: loli10K <ezomori.nozomu@gmail.com>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#6792
Closes openzfs#6794

man/man8/zpool.8

@@ -1983,9 +1983,10 @@ Display real paths for vdevs resolving all symbolic links. This can
 be used to look up the current block device name regardless of the
 .Pa /dev/disk/
 path used to open it.
-.It Fl p
-Display numbers in parsable (exact) values. Time values are in
-nanoseconds.
+.It Fl P
+Display full paths for vdevs instead of only the last component of
+the path. This can be used in conjunction with the
+.Fl L flag.
 .It Fl D
 Display a histogram of deduplication statistics, showing the allocated
 .Pq physically present on disk