documentation: `dtar` doesn't have a `--verbose` option

Hi!

The current documentation for dtar lists a --verbose option (https://mpifileutils.readthedocs.io/en/0.12-rtd/dtar.1.html#cmdoption-v), but that option doesn't seem to actually exist in dtar 0.12:

$ dtar -h

Usage: dtar [options] <source ...>

Options:
  -c, --create            - create archive
  -x, --extract           - extract archive
  -f, --file <FILE>       - specify archive file
  -C, --chdir <DIR>       - change directory to DIR before executing
      --preserve-owner    - preserve owner/group (default effective uid/gid)
      --preserve-times    - preserve atime/mtime (default current time)
      --preserve-perms    - preserve permissions (default subtracts umask)
      --preserve-xattrs   - preserve xattrs (default ignores xattrs)
      --fsync             - sync file data to disk on close
  -b, --bufsize <SIZE>    - IO buffer size in bytes (default 4MB)
  -k, --chunksize <SIZE>  - work size per task in bytes (default 4MB)
      --memsize <SIZE>    - memory limit per task for parallel read in bytes (default 256MB)
      --progress <N>      - print progress every N seconds
  -q, --quiet             - quiet output
  -h, --help              - print usage
For more information see https://mpifileutils.readthedocs.io.

And the option seems to be commented in the code:
https://github.com/hpc/mpifileutils/blob/v0.12/src/dtar/dtar.c#L153

Does the documentation need to be updated?

Inspect the dtar documentation linked in the issue and compare its options with the usage output shown there. Check src/dtar/dtar.c around line 153, then remove or correct the nonexistent --verbose entry and verify the rendered documentation no longer lists it.