add more emphasis on model uncertainty in tutorial

[baggepinnen]

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[JuliaControlBot]

This is an automated message.
Plots were compared to references. 11/11 images have changed, see differences below.
After pulling this PR, please update the reference images by creating a PR to ControlExamplePlots.jl here.

Difference	Reference Image	New Image
❌ 0.047
✔️ 0.011
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✔️ 0.007
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✔️ 0.0
⚠️ 0.028
❌ 0.06
✔️ 0.0
⚠️ 0.017

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (71091fc) 92.72% compared to head (30656f3) 0.30%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #889       +/-   ##
==========================================
- Coverage   92.72%   0.30%   -92.43%     
==========================================
  Files           5       5               
  Lines         330     329        -1     
==========================================
- Hits          306       1      -305     
- Misses         24     328      +304     

see 3 files with indirect coverage changes

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