docs(xvla): fix broken local file links in documentation

[kuafou]

Title

docs(xvla): fix broken local file links in documentation

Type / Scope

• Type: Docs
• Scope: xvla

Summary / Motivation

This PR fixes incorrect local file paths in the XVLA documentation.
Previously, some links pointed to absolute local paths (e.g., /home/...), which are not accessible to users and result in broken links.

This change replaces those paths with valid GitHub URLs to improve usability and documentation quality.

Related issues

• N/A

What changed

• Replaced local file paths with GitHub links in:

  • docs/source/xvla.mdx

• Updated references to:

  • action_hub.py
  • processor_xvla.py
  • configuration_xvla.py

How was this tested (or how to run locally)

• Manually verified that all updated links are accessible via browser
• Confirmed that links correctly point to the corresponding files in the repository

Checklist (required before merge)

• Linting/formatting run (pre-commit run -a)
• All tests pass locally (pytest)
• Documentation updated
• CI is green

Reviewer notes

• This is a documentation-only fix with no impact on code behavior
• Main focus is ensuring all links are valid and user-accessible