chore: improve trainer docstrings and contributing guide formatting

[VT69]

What this PR does / why we need it:

This PR improves documentation clarity and consistency in the Kubeflow Trainer SDK.

Changes include:

• Fix docstring punctuation inconsistencies in TrainerClient.
• Improve wording in trainer types documentation.
• Add a blank line after the "Requirements" header in CONTRIBUTING.md for better Markdown readability.

These changes improve documentation quality and follow standard Python docstring conventions (PEP 257). No functional changes were made.

Which issue(s) this PR fixes:

N/A

Checklist:

• Docs included if any changes are user-facing

[google-oss-prow]

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[github-actions]

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[Copilot]

Pull request overview

Improves documentation consistency and readability across the Kubeflow Trainer SDK by aligning docstrings with common conventions and cleaning up Markdown formatting.

Changes:

• Updated/clarified docstrings in Trainer types and TrainerClient.
• Improved wording for epochs documentation and updated external reference URL.
• Adjusted Markdown spacing in CONTRIBUTING.md (and normalized CLAUDE.md) for better rendering.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
kubeflow/trainer/types/types.py	Updates LoRA reference URL and clarifies epochs docstring text.
kubeflow/trainer/api/trainer_client.py	Docstring punctuation cleanup and minor docstring spacing change.
CONTRIBUTING.md	Adds blank lines after headers and removes whitespace-only lines that can affect Markdown rendering.
CLAUDE.md	Normalizes file content/formatting.

[astefanutti]

Thanks @VT69!

/lgtm

[astefanutti]

/ok-to-test

[VT69]

Thanks @VT69!

/lgtm

Thanks for the review! @astefanutti

[andreyvelich]

Can you revert changes from this file please?