[PR] MINOR: improve upgrade to v4.0.0 doc [kafka]

[via GitHub]

showuon opened a new pull request, #19172:
URL: https://github.com/apache/kafka/pull/19172

   In "Upgrading to 4.0.0 from any version 0.8.x through 3.9.x" section, we 
directly give instructions about  [Upgrading to KRaft-based 
clusters](https://kafka.apache.org/documentation/#upgrade_390_kraft), but there 
might still be some users under ZK cluster before upgrading to v4.0.0. We need 
to make it clear that they need to upgrade to KRaft mode first before upgrading 
to v4.0.0 in "Upgrading to 4.0.0 from any version 0.8.x through 3.9.x" section.
   
   Before:
   <img width="825" alt="image" 
src="https://github.com/user-attachments/assets/4309e963-a589-4003-b2fb-1acf5309b1f1";
 />
   
   After:
   
![image](https://github.com/user-attachments/assets/49af2a5f-266c-40f9-9d67-32ea066c9315)
   


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