Fix docstring mistakes in #1145

[chvogl]

This PR will fix some docstring errors from #1145.

How Has This Been Tested?

• Testing pipeline
• Reference Data Comparison following these instructions
• Not at all

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• None of the above (please describe)

Checklist:

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have built the documentation on my fork following these instructions
• I have assigned and requested two reviewers for this pull request

[codecov]

Codecov Report

Merging #1492 (e2b69da) into master (cf8900f) will not change coverage.
The diff coverage is n/a.

❗ Current head e2b69da differs from pull request most recent head 9b1f816. Consider uploading reports for the commit 9b1f816 to get more accurate results

@@           Coverage Diff           @@
##           master    #1492   +/-   ##
=======================================
  Coverage   68.12%   68.12%           
=======================================
  Files          68       68           
  Lines        6040     6040           
=======================================
  Hits         4115     4115           
  Misses       1925     1925           

Impacted Files	Coverage Δ
...is/tardis/plasma/properties/continuum_processes.py	39.20% <0.00%> (ø)
...rdis/plasma/properties/transition_probabilities.py	32.46% <0.00%> (ø)

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