Update readme.
Update readme.

- caveat on changing use_ssl settings
- point docs to cloudfoundry.org

[#69110612]

cloudfoundry/cf-mysql-release,ruanbinfeng/cf-mysql-release,CloudCredo/cf-mysql-release,CloudCredo/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,krishna-mk/cf-mysql-release,kbastani/cf-mysql-release,cloudfoundry/cf-mysql-release,kbastani/cf-mysql-release,kbastani/cf-mysql-release,krishna-mk/cf-mysql-release,CloudCredo/cf-mysql-release,ruanbinfeng/cf-mysql-release,krishna-mk/cf-mysql-release,ruanbinfeng/cf-mysql-release,ruanbinfeng/cf-mysql-release