[RIP-9]Change the "One consumequeue file content".

[RickySongyz]

What is the purpose of the change

Change "One consumequeue file consists of 30W entries, each entry can be randomly accessed like an array, each ConsumeQueue file's size is about 5.72M" to "One consumequeue file consists of 0.3 million entries, each entry can be randomly accessed like an array, each ConsumeQueue file's size is about 5.72MB"

Brief changelog

modified: docs/en/Design_Store.md

Verifying this change

XXXX

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[coveralls]

Coverage increased (+0.1%) to 49.453% when pulling b6daf1b on RickySongyz:songyz-pr into 5134a8e on apache:develop.

[zongtanghu]

@RickySongyz Please rebase your code in your local enviroment.

[duhenglucky]

@RickySongyz It would be nice if you can modify this PR as @zongtanghu @ShannonDing suggestion, and I will temporarily close this PR, and please feel free to reopen it if you want to do more work with it.