Improve more the error message with explicit recommendation
Following feedback.
The new message looks like:
```
# torch.nn.intrinsic.modules._FusedModule:
- Is public: it is inside the module's (`torch.nn.intrinsic.modules`) `__all__`
- Does NOT look public: because it starts with `_` (`_FusedModule`)
- You can do either of these two things to fix this problem:
- To make it NOT public: remove it from the modules's (`torch.nn.intrinsic.modules`) `__all__`
- To make it look public: remove the `_` at the beginning of the name
# torch.ao.nn.sparse.quantized.dynamic.linear.LinearBlockSparsePattern:
- Is public: it is an attribute that does not start with `_` on a module that does not have `__all__` defined
- Does NOT look public: because its `__module__` attribute (`torch.ao.nn.sparse.quantized.utils`) is not within the torch library or does not start with the submodule where it is defined (`torch.ao.nn.sparse.quantized.dynamic.linear`)
- You can do either of these two things to fix this problem:
- To make it NOT public: either define a `__all__` for `torch.ao.nn.sparse.quantized.dynamic.linear` or add a `_` at the beginning of the name
- To make it look public: make sure the `__module__` is properly set and points to a submodule of `torch.ao.nn.sparse.quantized.dynamic.linear`
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76261
Approved by: https://github.com/NivekT
