docs: improve structure for example templates (#9842)

Co-authored-by: Kyle Carberry <kyle@carberry.com>
Co-authored-by: Muhammad Atif Ali <atif@coder.com>
Co-authored-by: Muhammad Atif Ali <me@matifali.dev>

examples/jfrog/remote/main.tf

@@ -0,0 +1,16 @@
+module "docker" {
+  source                   = "cdr.jfrog.io/tf__main/docker/docker"
+  jfrog_host               = var.jfrog_host
+  artifactory_access_token = var.artifactory_access_token
+}
+
+variable "jfrog_host" {
+  type        = string
+  description = "JFrog instance hostname. For example, 'YYY.jfrog.io'."
+}
+
+variable "artifactory_access_token" {
+  type        = string
+  description = "The admin-level access token to use for JFrog."
+}
+