docs(openapi): add youtube to connector-slug examples in social.json
Summary
Adds `'youtube'` alongside `'googlesheets'` and `'tiktok'` in the example connector-slug strings in `AuthorizeConnectorRequest.connector`, `ConnectorInfo.slug`, and `ConnectorAction.connectorSlug` descriptions. Also bumps the prose example list in `/api/connectors` from "Google Sheets, TikTok" to include YouTube. No actual spec contract changes — the OpenAPI shape and example values were already permissive; this just keeps the human-readable examples honest now that YouTube has joined the Composio toolkit list.
Pairs with api#494 and chat#1719.
Test plan
- `jq empty` passes on `api-reference/openapi/social.json` (validated locally)
- Mintlify preview shows the updated example strings in the auto-generated docs for `/api/connectors`, `/api/connectors` POST, and `/api/connectors/actions`
Summary by cubic
Add youtube to connector slug examples in AuthorizeConnectorRequest.connector, ConnectorInfo.slug, ConnectorAction.connectorSlug, and the /api/connectors description to reflect supported connectors. Docs-only; no schema or API changes.