Add docs for configuring load balancer
Add docs for configuring load balancer

- document ports for HAProxy (not applicable for new switchboard proxy in development)

[#88628488]
krishna-mk/cf-mysql-release,krishna-mk/cf-mysql-release,kbastani/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,CloudCredo/cf-mysql-release,CloudCredo/cf-mysql-release,kbastani/cf-mysql-release,kbastani/cf-mysql-release,krishna-mk/cf-mysql-release,cloudfoundry/cf-mysql-release,CloudCredo/cf-mysql-release,cloudfoundry/cf-mysql-release