Update guides/source/active_record_validations.md

Co-authored-by: Petrik de Heus <[email protected]>

Author: Ridhwana

guides/source/active_record_validations.md

@@ -814,8 +814,8 @@ end
 ```irb
 account = Account.create(name: "Account A")
 
-supplier = Supplier.new(account: account)
-supplier.valid?
+irb> supplier = Supplier.new(account: account)
+irb> supplier.valid?
 => true # presence validation passes
 
 invalid_supplier = Supplier.new