pip2 incompatibilty is not a warning

[Mips2648]

Description

I would like to reduce number of useless questions on community. incompatibility between python2 and os > deb10 is not an issue, it's actually ok so let's show this in green

Suggested changelog entry

• Correction de l'écran "package"

Related issues/external references

Types of changes

• [ ] Bug fix (non-breaking change which fixes)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
  • [ ] This change is only breaking for integrators, not for external standards or end-users.
• [X] Documentation improvement

PR checklist

• [X] I have checked there is no other PR open for the same change.
• [X] I have read the [La ligne directrice pour contribuer à ce projet / Contribution guidelines for this project).
• [X] I grant the project the right to include and distribute the code under the GNU.
• [ ] I have added tests to cover my changes.
• [X] I have verified that the code complies with the projects coding standards.
• [ ] [Required for new sniffs] I have added MD documentation for the sniff.