Myasuka opened a new pull request #9604: [FLINK-13845][docs] Drop all the
content of removed Checkpointed interface
URL: https://github.com/apache/flink/pull/9604
## What is the purpose of the change
Drop all the content of removed `Checkpointed` interface.
## Brief
Myasuka opened a new pull request #9604: [FLINK-13845][docs] Drop all the
content of removed Checkpointed interface
URL: https://github.com/apache/flink/pull/9604
## What is the purpose of the change
Drop all the content of removed `Checkpointed` interface.
## Brief