Fixing typos in documentation and tutorials

[Sparks29032]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.07%. Comparing base (a02d3c4) to head (02c92c8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #229   +/-   ##
=======================================
  Coverage   99.07%   99.07%           
=======================================
  Files          21       21           
  Lines        1079     1084    +5     
=======================================
+ Hits         1069     1074    +5     
  Misses         10       10           

Files with missing lines	Coverage Δ
tests/test_morphio.py	100.00% <100.00%> (ø)

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