added line after docstring

[AFis-245]

Describe your changes
added a line after docstring

Type of update
Is this a:

• Update to documentation

Associated issues
Reference associated issue numbers. Does this pull request close any issues? FLK-D204

For the reviewer
See this page for instructions on how to review the pull request.

• PR functionality reviewed in a Jupyter Notebook
• All tests pass
• Test coverage remains 100%
• Documentation tested
• New documentation pages added to plantcv/mkdocs.yml
• Changes to function input/output signatures added to updating.md
• Code reviewed
• PR approved

[codecov]

Codecov Report

Merging #1397 (c34f21f) into main (6f086b7) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1397   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          158       158           
  Lines         6937      6937           
=========================================
  Hits          6937      6937           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
plantcv/plantcv/classes.py	100.00% <ø> (ø)

[nfahlgren]

@all-contributors please add @AFis-245 for code.

[allcontributors]

@nfahlgren

I've put up a pull request to add @AFis-245! 🎉