Set schema to array of items instead of single item [SA-15481] develop

[tomcdonnell]

For path 'get /api/user/{id}/group':

Documentation before change:

Documentation after change:

Actual response:

For path 'get /api/user/{id}':

Documentation before change:

Documentation after change:

Actual response:

[tomcdonnell]

There's still something strange showing in the API docs for groups, the [any-key] key is still displaying.

This has been fixed.