a handful of typos

[fchapoton]

found using codespell

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.70%. Comparing base (35b8b63) to head (e5a0629).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #102   +/-   ##
=======================================
  Coverage   59.70%   59.70%           
=======================================
  Files          78       78           
  Lines       23901    23901           
=======================================
  Hits        14271    14271           
  Misses       9630     9630           

Files with missing lines	Coverage Δ
lib/combinatorialmap.gi	88.27% <100.00%> (ø)

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[sunnyquiver]

Thank you very much for this update!