Spell and grammar checking for some tutorials.

[tobiasraabe]

Changes

Provide a description and/or bullet points to describe the changes in this PR.

Todo

• Reference issues which can be closed due to this PR with "Closes #x".
• Review whether the documentation needs to be updated.
• Document PR in docs/changes.rst.

[codecov]

Codecov Report

Merging #279 (c94b8b7) into main (a8d9e8a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #279   +/-   ##
=======================================
  Coverage   96.61%   96.61%           
=======================================
  Files          90       90           
  Lines        7623     7623           
=======================================
  Hits         7365     7365           
  Misses        258      258           

Flag	Coverage Δ
end_to_end	82.48% <ø> (ø)
integration	41.23% <ø> (ø)
unit	69.44% <ø> (ø)

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