fix create apps example syntax highlighting

Author: novekm

.header.md

@@ -196,7 +196,7 @@ module "aws-iam-identity-center" {
 
 ## Basic Usage - Create Applications and assign to Users and Groups
 
-```
+```hcl
   // Create desired Applications in IAM Identity Center
   sso_applications = {
     FirstApplication : {

README.md

@@ -197,7 +197,7 @@ module "aws-iam-identity-center" {
 
 ## Basic Usage - Create Applications and assign to Users and Groups
 
-```
+```hcl
   // Create desired Applications in IAM Identity Center
   sso_applications = {
     FirstApplication : {