[GitHub] flink issue #5384: [FLINK-8475][config][docs] Integrate akka options

[zentol]

Github user zentol commented on the issue:

    https://github.com/apache/flink/pull/5384
  
    Note that the existing docs were wrong regardless, see AkkaUtils:
    ```
        val startupTimeout = configuration.getString(
          AkkaOptions.STARTUP_TIMEOUT,
          (akkaAskTimeout * 10).toString)
    ```


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