redis-om docs use deprecated Client

[pether-b]

https://redis.io/docs/clients/om-clients/stack-node/ begins by introducing how to create and work with a Client, but the Client seems to have been deprecated with version 4.0. I'm new to this library so I can't tell yet, but maybe the whole page assumes the previous version of the library, in which case it would be nice with a rewrite or with a notice in the top informing about the version descrepancy.