feat(wandb): more explicit warning

pytorch_lightning/loggers/wandb.py

@@ -166,7 +166,8 @@ def log_metrics(self, metrics: Dict[str, float], step: Optional[int] = None) ->
         metrics = self._add_prefix(metrics)
         if self._sync_step and step is not None and step + self._step_offset < self.experiment.step:
             self.warning_cache.warn(
-                'Trying to log at a previous step. Use `sync_step=False` or try logging with `commit=False` when calling manually `wandb.log`.')
+                'Trying to log at a previous step. '
+                'Use `WandbLogger(sync_step=False)` or try logging with `commit=False` when calling manually `wandb.log`.')
         if self._sync_step:
             self.experiment.log(metrics, step=(step + self._step_offset) if step is not None else None)
         elif step is not None: