update comments based on https://github.com/datacommonsorg/website/pull/6327/changes#discussion_r3357862911

[shixiao-coder]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request improves code maintainability by adding descriptive comments to the build configuration script. These comments clarify the current dependency between custom feature flags and Spanner embeddings, providing context for future development and architectural transitions.

Highlights

• Documentation Update: Added clarifying comments in the run.sh script to explain the current conditional logic for feature flags and the long-term plan for Spanner embedding resolution.

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[gemini-code-assist]

Code Review

This pull request adds explanatory comments to the build/cdc_services/run.sh script regarding the conditional usage of custom feature flags when Spanner embeddings resolution is enabled. There are no review comments, and I have no feedback to provide.

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