docs: update TensorRT-LLM commit for NIXL to v1.2.0rc2 (#4582)

[dagil-nvidia]

docs: update TensorRT-LLM commit for NIXL to v1.2.0rc2 (cherry-pick to release/0.7.0)

Summary

Cherry-pick of PR #4582 from main to release/0.7.0.

Updates the TensorRT-LLM commit reference from main to v1.2.0rc2 in the documentation for NIXL KV cache transfer and EPD (Encode-Prefill-Decode) flow features.

Changes

• Updated docs/backends/trtllm/kv-cache-transfer.md to use --tensorrtllm-commit v1.2.0rc2
• Updated docs/backends/trtllm/multimodal_epd.md to use --tensorrtllm-commit v1.2.0rc2

Motivation

These features require a specific TensorRT-LLM version. Using main can lead to compatibility issues as the TensorRT-LLM main branch evolves. Pinning to v1.2.0rc2 ensures users build with the correct tested version for the 0.7.0 release.

Original PR

• Main PR: docs: update TensorRT-LLM commit for NIXL to v1.2.0rc2 #4582
• Merge commit: 93c8142

Testing

• Documentation builds without warnings
• No linter errors
• Changes are documentation only

Checklist

• Cherry-picked from main (PR docs: update TensorRT-LLM commit for NIXL to v1.2.0rc2 #4582)
• Commit includes DCO sign-off
• Changes are documentation only
• Branch pushed: dagil/cherrypick-trtllm-docs-v1.2.0rc2
• Cherry Pick table updated in #swdl-dynamo-release

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Cherry-Pick Info for Release Team:

• Type: docs
• Scope: Small (2 files, 2 lines)
• Risk: Very low (documentation only)
• Customer Impact: Ensures users build with correct TensorRT-LLM version for 0.7.0

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[dagil-nvidia]

/ok to test 95908bc

[github-actions]

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📖 View Latest Documentation: https://crispy-winner-3jnj38w.pages.github.io/release/0.7.0/pr-4586/

Latest Deployment:

• Commit: 4be41801 (latest push)
• Target: release/0.7.0
• Updated: 11/25/25, 10:11 PM UTC

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