[site]modify nettyMaxFrameSizeBytes Description

[hellozepp]

Descriptions of the changes in this PR:

Fixes #2079

Motivation

when the client-side attempt to send more than the default size bytes, it should set up the corresponding parameter setNettyMaxFrameSizeBytes(int maxSize)

(Explain: why you're making that change, what is the problem you're trying to solve)

Master Issue: #2079

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[sijie]

good job @hellozepp !

[sijie]

run bookkeeper-server replication tests

[sijie]

@hellozepp thank you for your contributions