Update upgrade-tidb-using-tiup.md

Co-authored-by: Frank945946 <[email protected]>
pingcap · Nov 4, 2024 · 2aa6d1f · 2aa6d1f
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@@ -50,7 +50,6 @@ This document applies to upgrading to TiDB 8.4.0 from the following: v6.1.x, v6.
 ## Upgrade caveat
 
 - TiDB currently does not support version downgrade or rolling back to an earlier version after the upgrade.
-- For the v4.0 cluster managed using TiDB Ansible, you need to import the cluster to TiUP (`tiup cluster`) for new management according to [Upgrade TiDB Using TiUP (v4.0)](https://docs.pingcap.com/tidb/v4.0/upgrade-tidb-using-tiup#import-tidb-ansible-and-the-inventoryini-configuration-to-tiup). Then you can upgrade the cluster to v8.4.0 according to this document.
 - Support upgrading the versions of TiCDC, TiFlash, and other components.
 - When upgrading TiFlash from versions earlier than v6.3.0 to v6.3.0 and later versions, note that the CPU must support the AVX2 instruction set under the Linux AMD64 architecture and the ARMv8 instruction set architecture under the Linux ARM64 architecture. For details, see the description in [v6.3.0 Release Notes](/releases/release-6.3.0.md#others).
 - For detailed compatibility changes of different versions, see the [Release Notes](/releases/release-notes.md) of each version. Modify your cluster configuration according to the "Compatibility Changes" section of the corresponding release notes.