Fix Kubernetes questions format

Was using 4 backticks instead of 3.

topics/aws/exercises/web_app_lambda_dynamodb/terraform/main.tf

@@ -0,0 +1,23 @@
+provider "aws" {
+  region = "us-west-1"
+}
+
+resource "aws_dynamodb_table" "users" {
+  name     = "users"
+  hash_key = "id"
+
+  attribute {
+    name = "id"
+    type = "S"
+  }
+
+  attribute {
+    name = "login"
+    type = "S"
+  }
+
+  global_secondary_index {
+    hash_key = 
+    
+  }
+}