Update max_message_size to reflect nap behavior change - https://docs.nginx.com/nginx-app-protect-waf/releases/release-notes-4.7/#resolved-issues

[jnewfield]

Proposed changes

Update max_message_size in example to be compatible with nap behavior change (after behavior change current example will result in NIC deployment failure) - https://docs.nginx.com/nginx-app-protect-waf/releases/release-notes-4.7/#resolved-issues

Checklist

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

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