Add Jump documentation (RCAL-115)

[dmggh]

Closes #

Resolves RCAL-115

Description
Documentation for the jump detection step (RCAL-115).

This PR addresses ...

Checklist

• Tests

• [X ] Documentation

• Change log

• Milestone

• Label(s)

[codecov]

Codecov Report

Merging #249 (f0732be) into main (f4ff08e) will decrease coverage by 11.78%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #249       +/-   ##
===========================================
- Coverage   58.16%   46.38%   -11.79%     
===========================================
  Files          36       35        -1     
  Lines         753      746        -7     
===========================================
- Hits          438      346       -92     
- Misses        315      400       +85     

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nightly	?

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Impacted Files	Coverage Δ
romancal/flatfield/flat_field.py	26.47% <0.00%> (-64.71%)	⬇️
romancal/flatfield/flat_field_step.py	28.00% <0.00%> (-56.00%)	⬇️
romancal/regtest/regtestdata.py	27.04% <0.00%> (-27.56%)	⬇️
romancal/stpipe/core.py	80.00% <0.00%> (-13.34%)	⬇️
setup.py

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[ddavis-stsci]

Looks good.

[nden]

@dmggh Is this superseded by #257? If so please close it.

[dmggh]

Superseded by #257 so closing.