fix: Add OPTARG to bash-words.txt

[rasa]

Per https://man7.org/linux/man-pages/man1/getopts.1p.html

Add/Fix Dictionary

Dictionary: bash

Description

• Add OPTARG to bash-words.txt

References

• https://man7.org/linux/man-pages/man1/getopts.1p.html

Checklist

• By submitting this pull-request, you agree to follow our Code of Conduct
• Verify that the title starts with the correct prefix:
  • fix: - for minor changes like adding words or fixing spelling issues.
  • feat: - for a significant change like adding a whole new set of words to a dictionary.
  • feat!: - for breaking changes, like file format or licensing changes.
  • chore: - for changes that do not impact the content of dictionaries.

[Jason3S]

@rasa,

Thank you.