nixos/matrix-synapse: don't use `services.postgresql.initialScript` in setup example

Closes #285688

This is misleading because `initialScript` will only be executed at the
*very first* run of postgresql. I.e. when deploying synapse to a server
with an existing postgresql, this won't work.

We don't have a good way of automatically provisioning databases
_declaratively_, so for now just explain what needs to be done here and
leave it to the user how to include this into their deployment.

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