Add PyPI metadata configuration to Python publishing documentation

[devin-ai-integration]

Add PyPI metadata configuration to Python publishing documentation

Summary

Added documentation for optional PyPI metadata configuration in the Python SDK publishing guide. This addresses the request to include PyPI project metadata information from the generators.yml reference page, enabling users to configure keywords, documentation links, and homepage links that appear on their PyPI package page.

The new section is added as an optional step in the "Configure SDK package settings" section, showing users how to add the metadata object with keywords, documentation-link, and homepage-link fields.

Review & Testing Checklist for Human

• Verify the placement of the new "Add PyPI metadata (optional)" step makes sense in the documentation flow (currently positioned after client-class-name configuration)
• Test the YAML example by generating a Python SDK with the metadata fields to confirm they work as documented
• Review whether any other PyPI-specific configuration from the generators.yml reference should be included (I focused on the metadata fields; there are also alternative authentication methods like username/password that weren't added)

Notes

• Successfully tested locally with fern docs dev - the documentation builds without errors
• The metadata fields (keywords, documentation-link, homepage-link) match exactly what's documented in the generators.yml reference page
• This addresses the Slack thread request to help users set up PyPI project metadata like in the screenshot example

Link to Devin run: https://app.devin.ai/sessions/8a8fa4cd9b6b4d5fa7f5005a567975e5
Requested by: adi@buildwithfern.com (@aditya-arolkar-swe)

[devin-ai-integration]

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