[aarti-956]

Description

Fixed a broken documentation link for contest providers in getSuggestion.ts.

Updated the URL to point to the current custom providers documentation.

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Checklist

• I've read the [contributing guide](https://github.com/continuedev/continue/blob/main/CONTRIBUTING.md).
• The relevant docs, if any, have been updated or created.
• The relevant tests, if any, have been updated or created.

Screen recording or screenshot

Not applicable — this change only updates a documentation URL.

Tests

Verified that the updated URL points to the current custom providers documentation.

No tests were added or updated.

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[aarti-956]

I have read the CLA Document and I hereby sign the CLA