Updated testing docs

[eytanadler]

Purpose

The test folder name changed and I updated it in the portion of the docs that discusses getting the files necessary for testing.

Expected time until merged

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Checklist

• I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[codecov]

Codecov Report

Merging #75 (5583a8c) into main (b6d5fdf) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
+ Coverage   79.43%   79.48%   +0.04%     
==========================================
  Files           4        4              
  Lines         423      424       +1     
==========================================
+ Hits          336      337       +1     
  Misses         87       87              

see 1 file with indirect coverage changes

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