[PD] doc: Document SGLANG_MOONCAKE_CUSTOM_MEM_POOL and supported values

[stmatengss]

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[gemini-code-assist]

Summary of Changes

Hello @stmatengss, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the documentation for the SGLANG_MOONCAKE_CUSTOM_MEM_POOL environment variable. The changes provide clearer guidance on its configuration options and integrate it into the general environment variables reference, improving user understanding of memory pool customization within the Mooncake backend.

Highlights

• Documentation Update for SGLANG_MOONCAKE_CUSTOM_MEM_POOL: Clarified the usage and supported values for the SGLANG_MOONCAKE_CUSTOM_MEM_POOL environment variable in the pd_disaggregation guide, updating the example to use NVLINK.
• Environment Variable Reference Expansion: Added SGLANG_MOONCAKE_CUSTOM_MEM_POOL to the comprehensive list of environment variables, detailing its description, supported types, and default value in the environment_variables.md reference.

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Changelog

• docs/advanced_features/pd_disaggregation.md
  • Updated the example usage of SGLANG_MOONCAKE_CUSTOM_MEM_POOL from True to NVLINK.
  • Added a new line explicitly listing the supported values for SGLANG_MOONCAKE_CUSTOM_MEM_POOL: NVLINK (or True), BAREX, and INTRA_NODE_NVLINK.
• docs/references/environment_variables.md
  • Introduced a new entry for SGLANG_MOONCAKE_CUSTOM_MEM_POOL in the environment variables table.
  • Provided a description for the variable, detailing its purpose to configure the custom memory pool type for Mooncake and listing its supported values.
  • Specified the default value for SGLANG_MOONCAKE_CUSTOM_MEM_POOL as None.

Activity

• The pull request was opened by stmatengss.
• No human activity (comments, reviews, or status updates) has been recorded yet.

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[gemini-code-assist]

Code Review

This pull request adds documentation for the SGLANG_MOONCAKE_CUSTOM_MEM_POOL environment variable in two places. My review focuses on improving the consistency and correctness of the new documentation. I've suggested using backticks for code elements and fixing a minor grammatical error to enhance clarity and align with the existing documentation style.