docs: update outdated repository links in pull request guide

[cmosantos]

Problem

The pull request contribution guide contains outdated links using:

SynkraAIinc/aiox-core

The current repository path is:

SynkraAI/aiox-core

These outdated URLs may confuse new contributors and lead to unavailable pages.

Proposed fix

Update the five affected links in:

docs/how-to-contribute-with-pull-requests.md

No code or behavior changes are involved. A focused pull request with the documentation correction will follow.

[github-actions]

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