docs: add PR number to CHANGELOG

Author: danroc

packages/keyring-api/CHANGELOG.md

@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- Add optional `details` field to `Transaction` type
+- Add optional `details` field to `Transaction` type ([#445](https://github.com/MetaMask/accounts/pull/445))
   - Add `SecurityAlertResponse` enum with values: `benign`, `warning`, `malicious`
   - Add optional `origin` field (string) to track transaction request source
   - Add optional `securityAlertResponse` field for Security Alert API responses