chore: Fixed role_* variables description

[kostasns]

Description

Fix description for few role_* variables to reflect correct service name.

Motivation and Context

Provide correct description.

Breaking Changes

N/A

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects

• [ x] I have executed pre-commit run -a on my pull request

[github-actions]

This PR has been automatically marked as stale because it has been open 30 days
with no activity. Remove stale label or comment or this PR will be closed in 10 days

[antonbabenko]

Already fixed (and merged) in #76

[github-actions]

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