hydra_zen.hydrated_dataclass unconditionally sets the docstring on the wrapped class using the target's __doc__

[lebrice]

Hi there!

When you use hydrated_dataclass, the __doc__ on the wrapped dataclass is unconditionally set to "A structured config designed to ..." followed by the docstring from the _target_.

This causes issues with doctest, since it picks up the doctests from the docstring of the target callable!

An example:

@hydra_zen.hydrated_dataclass(
    target=AutoTokenizer.from_pretrained,
    frozen=True,
    unsafe_hash=True,
    populate_full_signature=True,
)
class TokenizerConfig:
    """Configuration options for the tokenizer."""

    pretrained_model_name_or_path: str
    cache_dir: Path | None = None  # use standard cache by default.
    force_download: bool = False
    local_files_only: bool = False
    token: str | bool | None = None
    revision: str = "main"
    use_fast: bool = True
    config: PretrainedConfig | None = None
    # proxies: dict[str, str] = dataclasses.field(default_factory=dict, hash=False)
    subfolder: str = ""
    tokenizer_type: str | None = None
    trust_remote_code: bool = False

# fails!
assert TokenizerConfig.__doc__ == """Configuration options for the tokenizer."""