[now deploy] Change the warning messages when the platform version is changed (#2717)
[now deploy] Change the warning messages when the platform version is changed (#2717)

* [now deploy] Change warning message

* Change text

* Add link to message

* Change text

zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli