docs: fix Contributing Guide

[0xFloyd]

Relates to:

No specific issue. Minor documentation fix.

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Risks

Low.
Fixes a broken link in the documentation. No functional changes.

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Background

What does this PR do?

This PR fixes a broken link in the Contributing Guide section of docs/docs/guides/local-development.md.
The link was pointing to ../community/contributing.md and is now updated to /contributing.md.

What kind of change is this?

Improvements:
A minor change to existing documentation to fix a broken link.

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Documentation changes needed?

My changes do not require a change to the project documentation.

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Testing

Where should a reviewer start?

Start by reviewing the modified file:
docs/docs/guides/local-development.md.

Detailed testing steps

1. Open the file docs/docs/guides/local-development.md in the rendered documentation.
2. Click on the updated Contributing Guide link and verify it redirects correctly to /contributing.md.