fixed code block in import security keys section

README.md

@@ -63,9 +63,11 @@ export CELERY_PASSWORD="celery_pass"           # Celery service password
 ### 1.1 Configure Package Repositories
 
 # Import security keys
+```
 sudo rpm --import https://github.com/rabbitmq/signing-keys/releases/download/2.0/rabbitmq-release-signing-key.asc
 sudo rpm --import https://packagecloud.io/rabbitmq/erlang/gpgkey
 sudo rpm --import https://packagecloud.io/rabbitmq/rabbitmq-server/gpgkey
+```
 
 # Erlang Repository (AlmaLinux 8)
 ```