chore: fix secrets page formatting

Signed-off-by: Joonas Bergius <joonas@cosmonic.com>

docs/deployment/security/secrets.mdx

@@ -96,6 +96,7 @@ This payload is encrypted using the xkey provided in the `Wasmcloud-Host-Xkey` h
   // Omitted on success
   "error": ""
 }
+```
 
 A successful response will only contain the secret payload. An unsuccessful response should contain an error key with a string message describing the error. Examples of what might cause such an error include:
 
@@ -108,7 +109,7 @@ Secrets backend implementations may also have additional API endpoints as needed
 
 ### Secret stores
 
-All wasmCloud stores are secret references which are pieces of config that start with `secret_` and have the following structure:
+All wasmCloud stores are secret references which are pieces of config that start with `SECRET_` and have the following structure:
 
 ```rust
 #[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq, Hash)]