Modify docs

Author: duydl

docs/source-pytorch/common/trainer.rst

@@ -1102,6 +1102,8 @@ With the parameter set to false, you can add custom code to log hyperparameters.
         else:
             logger.log_hyperparams(hparams_dict_2)
 
+You can also use `self.logger.log_hyperparams(...)` inside `LightningModule` to log. 
+
 -----
 
 Trainer class API