Fix typo in hexagonal architecture documentation

[pascalgrimaud]

No description provided.

[codecov]

Codecov Report

Merging #2284 (41b7488) into main (e109701) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                main     #2284   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity      2460      2460           
===========================================
  Files            540       540           
  Lines           9336      9336           
  Branches         223       223           
===========================================
  Hits            9336      9336           

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