Refactor: remove "concurrently" language from module comments

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:test_tube: Branch testing instructions

This pull request can be tested locally with the following command:

npm exec --yes -- "github:emmercm/igir#emmercm/concurrent-comment-removal" [commands..] [options]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.09%. Comparing base (81f0402) to head (aa06979).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1164 +/- ## ======================================== Coverage 93.09% 93.09% ======================================== Files 103 103 Lines 6429 6429 Branches 1414 1519 +105 ======================================== Hits 5985 5985 Misses 443 443 Partials 1 1 ```

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