docs: removing optional identifier in arguments type definitions for the run function docstring

[leoporoli]

Description:

Commit Message

type: commit message

see the guidelines for commit messages.

Changelog Entry

version: <log entry>

Checklist:

• I have performed a self-review of my own code
• I have documented my code in accordance with the documentation guidelines
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have run the unit tests
• I only have one commit (if not, squash them into one commit).
• I have a descriptive commit message that adheres to the commit message guidelines

Please review the CONTRIBUTING.md file for detailed contributing guidelines.