Update sampleec2.tf

sampleec2.tf

 provider "aws" {
               profile = "default"
               region  = "us-east-1"
-              access_key = var.access_key
-              secret_key = var.secret_key
+              access_key = ${AWS_ACCESS_KEY}
+              secret_key = ${AWS_SECRET_ACCESS_KEY}
 }
 
+
+
+
+
+
 resource "aws_instance" "ec301" {
               ami ="ami-087c17d1fe0178315"
               instance_type =var.instance_type