[docs] Add documentation for reactor.netty-http-client-enabled property

[steveburnett]

Add documentation for the property reactor.netty-http-client-enabled.

Expected Behavior or Use Case

The property should be documented in the Presto documentation.

Presto Component, Service, or Connector

Documentation.

Context

Reviewing #26208, the Presto 0.295 release notes PR, I noticed a property reactor.netty-http-client-enabled that was mentioned in an entry appears to be undocumented.