Submodule documentation points to wrong submodule

[GabrielFerrarini]

Submodule documentation points to wrong submodule: https://registry.terraform.io/modules/GoogleCloudPlatform/cloud-run/google/latest/submodules/job-exec

The basic usage block says

```hcl
module "cloud_run_core" {
  source = "GoogleCloudPlatform/cloud-run/google//modules/secure-cloud-run-core"
  version = "~> 0.3.0"

  project_id = var.project_id
  name       = "simple-job"
  location   = "us-central1"
  image      = "us-docker.pkg.dev/cloudrun/container/job"
  exec       = true
}

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