fix hfss example

[gmalinve]

Pull Request Template

Description

Please provide a brief description of the changes in this pull request.

Checklist

Please complete the following checklist before submitting your pull request:

• I have tested these changes locally and verified that they work as intended.
• I have updated any documentation as needed to reflect these changes (if appropriate)
• I have verified that these changes to the best of my knowledge do not introduce any security vulnerabilities.
• Unit tests have been added (if appropriate)
• Test-cases have been added (if appropriate)
• Testing instructions have been added (if appropriate)