Update OCL code block to HCL format for consistency in policy examples

Author: hcrhall

src/pages/docs/platform-hub/policies/examples.md

@@ -645,7 +645,7 @@ If you prefer to write policies directly in your Git repository instead of using
 
 ### OCL file format
 
-```ocl
+```hcl
 name = "Policy Name"
 description = "Policy description"
 violation_reason = "Custom message shown when the policy fails"