adding changes from contributor pr 982 to v1.14 (#1004)

This PR applies changes from
https://github.com/hashicorp/web-unified-docs/pull/982/files to v1.14.x

Author: trujillo-adam

content/terraform/v1.14.x (beta)/docs/language/validate/index.mdx

@@ -120,7 +120,13 @@ For example, you can use a `postcondition` to detect if a user accidentally prov
 
 ```hcl
 data "aws_ami" "example" {
-  id = var.aws_ami_id
+  executable_users = ["self"]
+  most_recent      = true
+  owners           = ["self"]
+  filter {
+    name   = "name"
+    values = ["myami-*"]
+  }
 
   lifecycle {
     # The AMI ID must refer to an existing AMI that has the tag "nomad-server".