Correct Transit Gateway reference; Update with additional resources required to validate configuration.

Author: nphilbrook

docs/resources/aws_transit_gateway_attachment.md

@@ -27,6 +27,14 @@ resource "hcp_hvn" "main" {
 
 resource "aws_vpc" "example" {
   cidr_block = "172.31.0.0/16"
+  tags = {
+    Name = "example-vpc"
+  }
+}
+
+resource "aws_subnet" "example" {
+  vpc_id     = aws_vpc.example.id
+  cidr_block = "172.31.1.0/24"
 }
 
 resource "aws_ec2_transit_gateway" "example" {
@@ -35,6 +43,12 @@ resource "aws_ec2_transit_gateway" "example" {
   }
 }
 
+resource "aws_ec2_transit_gateway_vpc_attachment" "example" {
+  subnet_ids         = [aws_subnet.example.id]
+  transit_gateway_id = aws_ec2_transit_gateway.example.id
+  vpc_id             = aws_vpc.example.id
+}
+
 resource "aws_ram_resource_share" "example" {
   name                      = "example-resource-share"
   allow_external_principals = true
@@ -76,7 +90,10 @@ resource "aws_ec2_transit_gateway_vpc_attachment_accepter" "example" {
 resource "aws_route" "example" {
   route_table_id         = aws_vpc.example.main_route_table_id
   destination_cidr_block = hcp_hvn.main.cidr_block
-  transit_gateway_id     = aws_ec2_transit_gateway_vpc_attachment_accepter.example.id
+  transit_gateway_id     = aws_ec2_transit_gateway.example.id
+  depends_on = [
+    aws_ec2_transit_gateway_vpc_attachment.example
+  ]
 }
 ```