[doc] Add max message size configuration in doc (#9810)
[doc] Add max message size configuration in doc (#9810)

Motivation

Add documentation for configuring max message size.
massakam/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,massakam/pulsar,massakam/pulsar,yahoo/pulsar,yahoo/pulsar,merlimat/pulsar,merlimat/pulsar,massakam/pulsar