typos in utils.classes.py fixed

[sallory]

Description

Found some typos and decided to fix it

Type of change

• [ ] Documentation (typos, code examples or any documentation update)

Checklist

• [x] My code follows the style guidelines of this project (scripts/lint.sh has no errors)
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes