Update to outlier detection docs.

[mairanteodoro]

This PR updates two parameters from the outlier detection step (snr and scale) in order to match JWST (see JWST's PR#8177).

Checklist

• added entry in CHANGES.rst under the corresponding subsection
• updated relevant tests
• updated relevant documentation
• updated relevant milestone(s)
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.72%. Comparing base (a45c47d) to head (f412dd6).
Report is 463 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1062   +/-   ##
=======================================
  Coverage   76.72%   76.72%           
=======================================
  Files         105      105           
  Lines        7015     7015           
=======================================
  Hits         5382     5382           
  Misses       1633     1633           

Flag	Coverage Δ		*Carryforward flag
nightly	63.02% <ø> (ø)		Carriedforward from 6f78541

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