fix failing target instance custom network test to use google-beta provider (#3957) (#2463)

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/3957.txt

@@ -0,0 +1,3 @@
+```release-note:none
+
+```

google-beta/resource_compute_target_instance_generated_test.go

@@ -100,21 +100,25 @@ func TestAccComputeTargetInstance_targetInstanceCustomNetworkExample(t *testing.
 func testAccComputeTargetInstance_targetInstanceCustomNetworkExample(context map[string]interface{}) string {
 	return Nprintf(`
 resource "google_compute_target_instance" "custom_network" {
+  provider = google-beta
   name     = "tf-test-custom-network%{random_suffix}"
   instance = google_compute_instance.target-vm.id
   network  = data.google_compute_network.target-vm.self_link
 }
 
 data "google_compute_network" "target-vm" {
+  provider = google-beta
   name = "default"
 }
 
 data "google_compute_image" "vmimage" {
+  provider = google-beta
   family  = "debian-10"
   project = "debian-cloud"
 }
 
 resource "google_compute_instance" "target-vm" {
+  provider = google-beta
   name         = "tf-test-cusom-network-target-vm%{random_suffix}"
   machine_type = "n1-standard-1"
   zone         = "us-central1-a"

website/docs/r/compute_target_instance.html.markdown

@@ -82,21 +82,25 @@ resource "google_compute_instance" "target-vm" {
 
 ```hcl
 resource "google_compute_target_instance" "custom_network" {
+  provider = google-beta
   name     = "custom-network"
   instance = google_compute_instance.target-vm.id
   network  = data.google_compute_network.target-vm.self_link
 }
 
 data "google_compute_network" "target-vm" {
+  provider = google-beta
   name = "default"
 }
 
 data "google_compute_image" "vmimage" {
+  provider = google-beta
   family  = "debian-10"
   project = "debian-cloud"
 }
 
 resource "google_compute_instance" "target-vm" {
+  provider = google-beta
   name         = "cusom-network-target-vm"
   machine_type = "n1-standard-1"
   zone         = "us-central1-a"