[GitHub] [kafka] showuon opened a new pull request #8611: MINOR: Format the notation content for better readability

[GitBox]

showuon opened a new pull request #8611:
URL: https://github.com/apache/kafka/pull/8611


   **before:**
   
![image](https://user-images.githubusercontent.com/43372967/80954688-745c4580-8e30-11ea-9330-fe7f6321adce.png)
   
   Here, the notation words are not in different format, makes it hard to read. 
 Especially the last example `/hello -> world`, it's hard to understand it if 
you don't read carefully.
   
   **after:**
   
![image](https://user-images.githubusercontent.com/43372967/80954777-9ce43f80-8e30-11ea-851f-ab45a4f8f133.png)
   
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)
   


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