Swapped docstrings for `--multiple-targets` vs `--multiple-morphs`?

[tinatn29]

Problem

Current docstring says:

--multiple-morphs Changes usage to 'diffpy.morph [options] FILE
DIRECTORY'. FILE will be morphed with each file in
DIRECTORY as target. Files in DIRECTORY are sorted by
alphabetical order unless a field is specified by
--sort-by.
--multiple-targets Changes usage to 'diffpy.morph [options] DIRECTORY
FILE'. Each file in DIRECTORY will be morphed with
FILE as target. Files in DIRECTORY are sorted by
alphabetical order unless a field is specified by
--sort-by.

Are these switched by any chance? Based on the function names, I would think --multiple-morphs morphs each file in DIRECTORY onto a single TARGET, and --multiple-targets morphs a single FILE onto multiple targets in a DIRECTORY.

Proposed solution

Double check and correct the docstring as needed.

[sbillinge]

Also, these docstrings are very hard to read and understand. Can we have a quick discussion about usage and then try and come up with clearer descriptions?