Update pubspec package description

[jama5262]

What does this PR do?

Update pubspec package description

Issue Reference

Fixes #

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Maintenance change (non-breaking change such as upgrading a dependency, refactoring, or making a lint fix)
• [x] Documentation update
• [ ] Breaking change (a fix or feature that would cause existing functionality to change)

Screenshots

If applicable, add screenshots to help explain your problem.

Checklist

• [ ] Wrote additional tests, if needed
• [ ] All tests have passed
• [ ] I have updated the documentation accordingly, if needed.

Additional Information