Other: Fix some typos

[JoshuaLampert]

Describe your changes here:

In DLR-AMR/T8code.jl#93, we noticed some typos. So I looked into the currently failing spell checker action (https://github.com/DLR-AMR/t8code/actions/runs/18144823706/job/51644153494?pr=1885) and fixed all the typos, which are found.
Sorry for the other white space changes. My editor automatically removes trailing white spaces.

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[Davknapp]

Thanks a lot for your contribution and fixing all of these errors!
Welcome to the t8code-contributors!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.42%. Comparing base (27293b8) to head (b09a864).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1886   +/-   ##
=======================================
  Coverage   74.42%   74.42%           
=======================================
  Files         101      101           
  Lines       19204    19204           
=======================================
  Hits        14293    14293           
  Misses       4911     4911           

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