docs: update command descriptions to be more descriptive

[chlins]

This pull request updates the short descriptions for all CLI commands in the cmd package to provide clearer and more user-friendly explanations of each command's purpose and usage. The changes focus on making the help output more descriptive and actionable for users.

Improvements to command descriptions:

Model artifact management commands:

• Updated attach, build, extract, fetch, inspect, list, prune, pull, push, rm, tag, and upload command descriptions to more clearly explain their functionality and expected usage, replacing generic text with concise, user-focused explanations. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]

Registry authentication commands:

• Improved descriptions for login and logout commands to directly state their purpose ("Login to a registry" and "Logout from a registry"). [1] [2]

Root command description:

• Clarified the root modctl command description to reference the "ModelPack Specification" instead of the previous "Model Format Specification".

[gemini-code-assist]

Summary of Changes

Hello @chlins, 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 aims to enhance the user experience of the modctl CLI by updating the short descriptions for various commands within the cmd package. The changes provide clearer, more user-friendly, and actionable explanations of each command's purpose, improving the overall help output for users interacting with model artifact management and registry authentication functionalities.

Highlights

• Improved Model Artifact Command Descriptions: Updated short descriptions for 12 model artifact management commands (attach, build, extract, fetch, inspect, list, prune, pull, push, rm, tag, upload) to be more precise and user-focused.
• Enhanced Registry Authentication Command Descriptions: Improved short descriptions for login and logout commands to clearly state their authentication purpose.
• Clarified Root Command Description: Revised the root modctl command description to accurately refer to the 'ModelPack Specification' instead of the previous 'Model Format Specification'.

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[gemini-code-assist]

Code Review

This pull request is a good step towards improving the CLI's usability by making command descriptions more informative. While many descriptions are improved, several are overly verbose for a 'short' description, contain minor grammatical errors, or use passive language. I've provided specific suggestions to make these descriptions more concise, active, and clear, which is standard practice for CLI help text. These changes will help ensure the help output is as user-friendly as possible.

[gaius-qi]

LGTM