Avoid autogenerating docs for Python files with leading underscore (#2397)

* Avoid autogenerating docs for Python files with leading underscore
Signed-off-by: Tim Moon <tmoon@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci



* Do not exclude __init__.py files from doc generation
Signed-off-by: Tim Moon <tmoon@nvidia.com>

---------
Signed-off-by: Tim Moon <tmoon@nvidia.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs/conf.py

@@ -101,3 +101,4 @@ breathe_default_project = "TransformerEngine"
 
 autoapi_generate_api_docs = False
 autoapi_dirs = [root_path / "transformer_engine"]
+autoapi_ignore = ["*/_[!_]*"]