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 - Fix HttpClientBuilder сode and add options for Connection Management to increase the proxying performance wiremock#2744

Submitter checklist

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

Details: Contributor Guide