Fix Broken Link to Integrations

[neilkakkar]

I noted that we redirect docs/integrations/* to docs/libraries/*, but found this specific one to be broken. Not sure if I should be fixing it like this, or by adding to a redirect rule.

Checklist

• All querysets/queries filter by Organization, by Team, and by User
• Django backend tests
• Jest frontend tests
• Cypress end-to-end tests
• Migrations are safe to run at scale (e.g. PostHog Cloud) – present proof if not obvious

[mariusandra]

Definitely good to fix things at the source, so thanks for this! :)