[PyTorch] Update docs/example and benchmarks/ scripts

[cyanguwa]

Description

This PR updates some of the scripts in docs/example/attention and benchmarks/attention.

• docs/example/attention/example_attention.py
• docs/example/attention/arbitrary_mask_to_post_scale_bias.py
• benchmarks/attention/benchmark_attention.py

Type of change

• [x] 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 refractor

Changes

Please list the changes introduced in this PR:

• Update docs/example and benchmarks/ scripts

Checklist:

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