feat: Add GroupDescription field to /v1/groups resource struct (11.19)

[neilmartin83]

Change

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We have a field in the response for the new Description box in groups so added it to the types in the SDK that reference API endpoints where it was added.

Type of Change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update (Wiki)
• Refactor (refactoring code, removing code, changing code structure)

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