liuzhuang2017 opened a new pull request, #19506:
URL: https://github.com/apache/flink/pull/19506

   ## What is the purpose of the change
   ### English document:
   - The markdown file is located in 
docs/content/docs/deployment/memory/mem_migration.md.
   
   
![image](https://user-images.githubusercontent.com/95120044/163784015-6db94a70-bd26-486e-ae96-8c4b2a3e43ff.png)
   
   ### Chinese document:
   
   - The markdown file is located in 
docs/content.zh/docs/deployment/memory/mem_migration.md.
   
![image](https://user-images.githubusercontent.com/95120044/163784132-aedcc89a-5266-4378-9293-828cf00fbdf4.png)
   
   **According to the Chinese and English documentation above, I think "Mb" in 
it should be "MB". Because Mb and MB are not the same,in terms of memory, a 
byte is the smallest storage slot. Your hard drives, SSDs, USB sticks, and 
system memory are always measured in bytes.**
   Please see "https://www.lifewire.com/what-is-a-megabit-2483412"; for detailed 
differences.
   According to experience, they have the following relationship:
   - 8 Mb = 1 MB
   - 1Mb = 1/8 MB = 0.125 MB
   
   ## Brief change log
   
   Changed "Mb" in the documentation to "MB".
   
   
   ## Verifying this change
   
   This change is a trivial rework / code cleanup without any test coverage.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): ( no)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
     - The serializers: (no )
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no )
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? ( no)
   
   


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