Fix documentation typo in docs/configuration/

Merged username-removed-664717 requested to merge dikarel/gitlab-ci-multi-runner:master into master

What does this MR do?

Fixes a typo in the documentation file docs/configuration/

Why was this MR needed?

The documentation file in question suggests running the command sudo usermod -aG user docker, which does not run when tested on Ubuntu.

It should be sudo usermod -aG docker user instead

Are there points in the code the reviewer needs to double check?


Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

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