Update docs for applications_sync

[dsyers]

Description

Update the docs (https://registry.terraform.io/providers/argoproj-labs/argocd/latest/docs/resources/application_set) to include sync_policy at the appset level i.e.

resource "argocd_application_set" "this" {
  spec {
    sync_policy {
      applications_sync = "sync"
    }
}

I had to dig around in the schema to find it

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