📝 Add docstrings to barrier_0820

[coderabbitai]

Docstrings generation was requested by @LeiWang1999.

• [Refactor] Refactor barrier management #744 (comment)

The following files were modified:

• examples/warp_specialize/example_warp_specialize_flashmla.py
• examples/warp_specialize/example_warp_specialize_gemm_copy_0_gemm_1.py
• src/op/elem.cc
• src/target/codegen_cuda.cc
• src/target/codegen_cuda.h
• src/target/codegen_hip.cc
• src/tl_templates/cuda/barrier.h
• src/tl_templates/cuda/common.h
• src/tl_templates/cuda/copy_sm90.h
• src/transform/inject_fence_proxy.cc
• src/transform/lower_device_storage_access_info.cc
• src/transform/lower_shared_barrier.cc
• src/transform/storage_rewrite.cc
• src/transform/warp_specialized_rewriter.cc
• testing/python/autotune/test_tilelang_autotune_with_inputs.py
• tilelang/engine/phase.py
• tilelang/jit/kernel.py

These files were kept as they were

• examples/dequantize_gemm/test_example_dequantize_gemm.py
• src/op/builtin.h

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