[SITE] modify nettyMaxFrameSizeBytes Description
[SITE] modify nettyMaxFrameSizeBytes Description

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 




Reviewers: Enrico Olivelli <eolivelli@gmail.com>, Sijie Guo <sijie@apache.org>

This closes #2086 from hellozepp/issue-2079
sijie/bookkeeper,sijie/bookkeeper,apache/bookkeeper,apache/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,apache/bookkeeper,apache/bookkeeper,apache/bookkeeper,apache/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,sijie/bookkeeper