docs: updated English

[timcadman]

How to test:

• You can trust my English so it is not necessary to review all my corrections
• I think it is sufficient to just check that it passes the CI and that the only files I have changed are .md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.2%. Comparing base (5d4b52a) to head (9b908e3).

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #127   +/-   ##
======================================
  Coverage    85.2%   85.2%           
======================================
  Files           9       9           
  Lines         522     522           
======================================
  Hits          445     445           
  Misses         77      77           

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