wandb: Fix example rendering for docs (#5905)

Co-authored-by: Jirka Borovec <Borda@users.noreply.github.com>
Co-authored-by: Carlos Mocholí <carlossmocholi@gmail.com>

pytorch_lightning/loggers/wandb.py

@@ -61,9 +61,7 @@ class WandbLogger(LightningLoggerBase):
         \**kwargs: Additional arguments like `entity`, `group`, `tags`, etc. used by
             :func:`wandb.init` can be passed as keyword arguments in this logger.
 
-    Example:
-
-    .. code-block:: python
+    Example::
 
         from pytorch_lightning.loggers import WandbLogger
         from pytorch_lightning import Trainer