Added a bit of formatting for readability

examples/aws-rds/README.md

@@ -6,12 +6,13 @@ The example creates db subnet groups and a VPC security group as inputs to the i
 
 For AWS provider, set up your AWS environment as outlined in https://www.terraform.io/docs/providers/aws/index.html
 
-If you need to use existing security groups and subnets, remove the sg.tf and subnets.tf files and replace the corresponding sections in main.tf under aws_db_instance
+If you need to use existing security groups and subnets, remove the `sg.tf` and `subnets.tf` files and replace the corresponding sections in `main.tf` under `aws_db_instance`
 
 Pass the password variable through your ENV variable.
 
 Several parameters are externalized, review the different variables.tf files and change them to fit your needs. Carefully review the CIDR blocks, egress/ingress rules, availability zones that are very specific to your account.
 
-Once ready run 'terraform plan' to review. At the minimum, provide the vpc_id as input variable.
+Once ready run `terraform plan` to review. 
+At the minimum, provide the vpc_id as input variable.
 
-Once satisfied with plan, run 'terraform apply'  
+Once satisfied with plan, run `terraform apply`