Avoid autogenerating docs for Python files with leading underscore

[timmoon10]

Description

We've experienced CI failures due to hangs when generating docs, possibly because self imports in transformer_engine/debug/features/_test_dummy_feature.py are causing infinite recursion. This PR attempts to fix this issue by excluding this file from doc generation.

#2301 is another attempt to fix problems with documentation, although I don't think it addresses anything with _test_dummy_feature.py.

Type of change

• Documentation change (change only to the documentation, either a fix or a new content)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Infra/Build change
• Code refactoring

Changes

• Avoid generating docs for Python files with leading underscore

Checklist:

• I have read and followed the contributing guidelines
• The functionality is complete
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[timmoon10]

Pipeline 38744752 is green.

[greptile-apps]

Greptile Summary

• Fixes CI documentation hangs by excluding private Python files (with leading underscore) from autoapi doc generation
• Pattern */_[!_]* correctly excludes internal files like _test_dummy_feature.py, _common.py while preserving __init__.py files

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The change is a single-line configuration addition that follows Python conventions for excluding private modules from documentation. The glob pattern correctly targets files with single underscore prefix while preserving __init__.py files. This directly addresses the CI hang issue caused by self-imports in _test_dummy_feature.py.
• No files require special attention

Important Files Changed

Filename	Overview
docs/conf.py	Added glob pattern to exclude private Python files (starting with single underscore) from doc generation while preserving __init__.py files

Sequence Diagram

sequenceDiagram
    participant Dev as "Developer"
    participant Sphinx as "Sphinx Doc Builder"
    participant AutoAPI as "AutoAPI Extension"
    participant FS as "File System"
    
    Dev->>Sphinx: "Trigger doc build"
    Sphinx->>AutoAPI: "Generate API docs"
    AutoAPI->>FS: "Scan transformer_engine/"
    FS-->>AutoAPI: "Return Python files"
    AutoAPI->>AutoAPI: "Apply autoapi_ignore pattern */_[!_]*"
    AutoAPI->>AutoAPI: "Exclude _test_dummy_feature.py, _common.py, etc"
    AutoAPI->>AutoAPI: "Include __init__.py files"
    AutoAPI->>Sphinx: "Generate docs for filtered files"
    Sphinx-->>Dev: "Documentation built successfully"

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[greptile-apps]

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[pggPL]

LGTM