Fix tutorial usage of threshold parameter

[tapastro]

Resolves JP-nnnn

Closes #

This PR addresses outdated usage of the jump threshold parameter, which was renamed to rejection_threshold.

Checklist for maintainers

• added entry in CHANGES.rst within the relevant release section
• updated or added relevant tests
• updated relevant documentation
• added relevant milestone
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below.
  How to run regression tests on a PR
• Make sure the JIRA ticket is resolved properly

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (269bedc) 77.56% compared to head (559e5cc) 77.56%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7572   +/-   ##
=======================================
  Coverage   77.56%   77.56%           
=======================================
  Files         455      455           
  Lines       36340    36340           
=======================================
  Hits        28188    28188           
  Misses       8152     8152           

Flag	Coverage Δ		*Carryforward flag
nightly	77.62% <ø> (ø)		Carriedforward from 269bedc

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[hbushouse]

LGTM