e2e journey prereq step: incorrect linux command to add user

[hokonohara]

Current Behavior

The docs state to use addusr, but the correct command is adduser (with 'e')

Expected Behavior

Correct the docs with following:

sudo adduser tx01 docker                       # adds the user to the group docker 

Steps To Reproduce

docs link:
https://eclipse-tractusx.github.io/docs/tutorials/e2e/prerequisites/#setup-a-user-environment-for-running-the-tutorial-with-a-minimum-set-of-privileges