fix: update specification for model weight media types

[aftersnow]

Clarified descriptions for application/vnd.cncf.model.weight.v1.tar+gzip and application/vnd.cncf.model.weight.v1.tar+zstd to specify that they contain the model weight file, ensuring consistency in the documentation.

[gemini-code-assist]

Summary of Changes

Hello @aftersnow, 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 refines the official specification by clarifying the purpose of specific model weight media types. The changes aim to enhance documentation accuracy and consistency, ensuring that the descriptions precisely reflect the content of the archived model weight files.

Highlights

• Documentation Clarity: Updated the descriptions for application/vnd.cncf.model.weight.v1.tar+gzip and application/vnd.cncf.model.weight.v1.tar+zstd media types in docs/spec.md.
• Specification Consistency: Ensured that the descriptions for compressed model weight media types (+gzip, +zstd) accurately reflect that they contain the model weight file, aligning with the description for the uncompressed .tar type.

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[gemini-code-assist]

Code Review

This pull request correctly updates the descriptions for the application/vnd.cncf.model.weight.v1.tar+gzip and application/vnd.cncf.model.weight.v1.tar+zstd media types to state that they contain model weight files, not configuration files. This is a good clarification. I've added a couple of suggestions to further improve consistency in the specification by adding guidance on handling multiple weight files, similar to what's already present for the uncompressed tar media type.

[gaius-qi]

LGTM

[imeoer]

LGTM

[chlins]

lgtm