improved readability in terraform topic README (bregman-arie#395)

Author: c-lonas

topics/terraform/README.md

@@ -359,7 +359,7 @@ False. You can specify any provider from any URL, not only those from hashicorp.
 #### Input Variables
 
 <details>
-<summary>What input variables are good for in Terraform?</summary><br><b>
+<summary>What are input variables good for in Terraform?</summary><br><b>
 
 Variables allow you define piece of data in one location instead of repeating the hardcoded value of it in multiple different locations. Then when you need to modify the variable's value, you do it in one location instead of changing each one of the hardcoded values.
 </b></details>
@@ -1874,4 +1874,4 @@ If it's a matter of changing a resource name, you could make use of `terraform s
 
 Use the meta-argument `depends_on` in the app resource definition. This way the app will depend on the cluster resource and order will be maintained in creation of the resources.
 
-</b></details>
+</b></details>