Add a note about observation noise in the posterior in fit_model_with_torch_optimizer notebook.

[saitcakmak]

Addresses #1195.

[codecov]

Codecov Report

Merging #1196 (444b004) into main (46fc326) will not change coverage.
The diff coverage is n/a.

❗ Current head 444b004 differs from pull request most recent head e36b79d. Consider uploading reports for the commit e36b79d to get more accurate results

@@           Coverage Diff           @@
##             main    #1196   +/-   ##
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  Coverage   99.99%   99.99%           
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  Files         115      115           
  Lines       10137    10137           
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  Hits        10136    10136           
  Misses          1        1           

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[Balandat]

thanks!