fix(docs): remove stand-specific hardcodes

docs/curated/postgres/pg_user_db.md

@@ -27,8 +27,8 @@ s3_name   = "my-s3"                  # ИМЯ экземпляра S3 (не UUID
 terraform {
   required_providers {
     nubes = {
-      source  = "tf-registry.containerk8s.services.ngcloud.ru/nubes-test/nubes"
-      version = "5.0.5"
+      source  = "{{PROVIDER_SOURCE}}"
+      version = "{{VERSION}}"
     }
   }
 }
@@ -39,7 +39,7 @@ variable "s3_name"   { type = string }
 
 provider "nubes" {
   api_token    = var.api_token
-  api_endpoint = "https://lk-api-gateway-test.ngcloud.ru/api/v1/svc"
+  api_endpoint = "{{NUBES_API_ENDPOINT}}"
 }
 ```