[8.13](backport #40231) update max_number_of_messages parameter description #40340
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Proposed commit message
This PR is to update the documentation for max_number_of_messages to inform users to be cautious when using a large value for this var.
Checklist
CHANGELOG.next.asciidoc
orCHANGELOG-developer.next.asciidoc
.This is an automatic backport of pull request #40231 done by [Mergify](https://mergify.com).