JOSS proofread

[gabrieldansereau]

What the pull request does

Proofreading edits for JOSS publication. https://github.com/openjournals/joss-reviews/issues/2872#issuecomment-766901711

Type of change

Please indicate the relevant option(s)

• [x] :bug: Bug fix (non-breaking change which fixes an issue)
• [ ] :sparkle: New feature (non-breaking change which adds functionality)
• [ ] :boom: Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] :book: This change requires a documentation update

Checklist

• [x] The changes are documented
  • [x] The docstrings of the different functions describe the arguments, purpose, and behavior
  • [x] There are examples in the documentation website
• [x] The changes are tested
• [x] The changes do not modify the behavior of the previously existing functions
  • If they do, please explain why and how in the introduction paragraph
• [x] For new contributors - my name and information are added to .zenodo.json
• [x] The Project.toml field version has been updated
  • Change the last number for a v0.0.x series release, a bug fix, or a performance improvement
  • Change the middle number for additional features that do not break the current test suite (unless you fix a bug in the test suite)
  • Change the first number for changes that break the current test suite