docs: capitalize terraform

Co-authored-by: Sören Martius <[email protected]>

Author: kassianh

README.tfdoc.hcl

@@ -42,9 +42,9 @@ section {
     on [Amazon Web Services (AWS)][AWS].
 
     *This module supports Terraform v1.x, v0.15, v0.14, v0.13 as well as v0.12.20 and above
-    and is compatible with the terraform AWS provider v3.19 and above.*
+    and is compatible with the Terraform AWS provider v3.19 and above.*
 
-    The last version supporting terraform AWS provider v2.x is v0.4.1.
+    The last version supporting Terraform AWS provider v2.x is v0.4.1.
   END
 
   section {