MINOR: Update upgrade notes for 4.0.0 (#18960)

Details:
1. Upgrades to 4.0.x are only supported from 3.3.x and for kraft mode clusters
2. Add rolling upgrade instructions for 4.0.x
3. Clarify the message for zk to kraft migrations
4. Remove all the upgrade instructions for older versions (they can still be found in the upgrade notes for older releases)

Reviewers: Chia-Ping Tsai <chia7712@gmail.com>, David Jacot <djacot@confluent.io>
This commit is contained in:
Ismael Juma 2025-02-19 09:32:50 -08:00
parent 44495e4dde
commit da8f390c45
1 changed files with 31 additions and 2644 deletions

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