Render resources without URL correctly in Markdown and Asciidoc

Signed-off-by: Khosrow Moossavi <khos2ow@gmail.com>

examples/main.tf

@@ -43,10 +43,15 @@ terraform {
   required_providers {
     random = ">= 2.2.0"
     aws    = ">= 2.15.0"
+    foo = {
+      source  = "https://registry.acme.com/foo"
+      version = ">= 1.0"
+    }
   }
 }
 
 resource "tls_private_key" "baz" {}
+resource "foo_resource" "baz" {}
 
 data "aws_caller_identity" "current" {
   provider = "aws"
@@ -74,5 +79,5 @@ module "baz" {
 }
 
 module "foobar" {
-  source  = "git@github.com:module/path?ref=v7.8.9"
+  source = "git@github.com:module/path?ref=v7.8.9"
 }