[python] Fixing Python tutorial doc strings to address comments from PR 9272

[derek-gerstmann]

Adjusting python tutorial 15 doc strings to address comments from review #9272

Checklist

• Tests added or updated (not required for docs, CI config, or typo fixes)
• Documentation updated (if public API changed)
• Python bindings updated (if public API changed)
• Benchmarks are included here if the change is intended to affect performance.
• Commits include AI attribution where applicable (see Code of Conduct)

[alexreinking]

While we're here, can you ask Claude to figure out a way to display Python-only tutorials in the docs website? Right now, this lesson isn't rendered.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.07%. Comparing base (36c47dc) to head (839a324).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9406      +/-   ##
==========================================
- Coverage   70.17%   70.07%   -0.11%     
==========================================
  Files         261      261              
  Lines       79396    79396              
  Branches    19358    19358              
==========================================
- Hits        55717    55637      -80     
- Misses      17896    17897       +1     
- Partials     5783     5862      +79     

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[derek-gerstmann]

Fixed python tutorial 15 display in PR #9408