release notes: fix version in links (#20835)

Author: hfxsd

releases/release-8.5.1.md

@@ -9,7 +9,7 @@ Release date: January 17, 2025
 
 TiDB version: 8.5.1
 
-Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.1/quick-start-with-tidb) | [Production deployment](https://docs.pingcap.com/tidb/v8.1/production-deployment-using-tiup)
+Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with-tidb) | [Production deployment](https://docs.pingcap.com/tidb/v8.5/production-deployment-using-tiup)
 
 ## Operating system and platform requirement changes