Update datasets.md

[jennyyangyi-magic]

Added recommended dataset profiles for four usecases

[nm-red-hat-upstream-automation-bot]

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[Copilot]

Pull Request Overview

This PR adds recommended dataset profiles for four use cases to the documentation and cleans up an extra blank line in the CLI utility.

• Added dataset profile examples (prompt/output token settings) for Chat, RAG, Summarization, and Code Generation in docs/datasets.md.
• Removed an unnecessary blank line before the get_metavar method in src/guidellm/utils/cli.py.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/guidellm/utils/cli.py	Remove extra blank line before get_metavar method
docs/datasets.md	Add recommended dataset profiles for four common use cases

[nm-red-hat-upstream-automation-bot]

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[nm-red-hat-upstream-automation-bot]

📦 Build Artifacts Available
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