Add new command line options description (--max-http-client-connections and --disable-connection-reuse)

[MuTalKing]

Make PR to wiremock with HttpClientBuilder fix and new command lines options to flexibly manage HttpClient

References

• PR to wiremock - https://github.com/wiremock/wiremock/pull/2744

Submitter checklist

• [x] The PR request is well described and justified, including the body and the references
• [x] The PR title represents the desired changelog entry
• [x] If the change against WireMock 2 functionality (incompatible with WireMock 3), it is submitted against the 2.x branch
• [x] The repository's code style is followed (see the contributing guide)

Details: Contributor Guide