Password rules airfrance

[dmmaslenn]

Overall Checklist

• [x ] I agree to the project's Developer Certificate of Origin
• [ x] The top-level JSON objects are sorted alphabetically
• [ x] There are no open pull requests for the same update

for password-rules.json

• [ x] The given rule isn't particularly standard and obvious for password managers
• [x ] Generated passwords have been tested from this rule using the Password Rules Validation Tool
• [x ] Information has been included about the website's requirements (eg. screenshots, error messages, steps during experimentation, etc.)
• [ x] The PR isn't documenting something that would be a common practice among password managers (e.g. minimal length of 6)

Reason: airfrance.com/.us has specific length limitation 8-12 characters.