[breaking change detector] Optimization about `Operation` and `Operation Group`

When SDK adds new operation group and operation, part of reported changelog is https://github.com/Azure/azure-sdk-for-python/pull/37830/files#diff-2a3477ac28d53feb0088a2070be32bb4dd794980be7cbb13fa553659a3cb845f

```
- Added model `LicensesOperations`
- Model `MachinesOperations` added method `begin_install_patches`
```

tool reported the change in accurate however `LicensesOperations` and `MachinesOperations` is not model but Operation Group, so I think the report shall be
```
- Added operation group `LicensesOperations`
- Operation group `MachinesOperations` added method `begin_install_patches`
```
nit: Model class is usually in file `_models*.py`; Operation Group class is usually in file `_operations*.py` and name always have suffix `Operations`.