Fix a few typos in tutorials

[pitmonticone]

Please confirm that this PR has done the following:

• [ ] Tests Added
• [ ] Documentation Added
• [x] Name of contributors Added to AUTHORS.rst
• [x] Description in RELEASE_NOTES.md Added

Description of PR

I've just fixed a few typos in the tutorials.

[codecov[bot]]

Codecov Report

Merging #732 (0924e07) into main (128fb19) will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##            main    #732   +/-   ##
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  Coverage   95.0%   95.0%           
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  Files         59      59           
  Lines       6020    6020           
=====================================
  Hits        5725    5725           
  Misses       295     295           

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[pitmonticone]

Thank you @danielhuppmann for making those great tutorial notebooks publicly available for free!