fix docs rendering in datamodule (#7064)

* [docs]: add newline to correctly render Example

* whitespace

Co-authored-by: Matthew Sarmiento <matthewcs@me.com>

pytorch_lightning/core/datamodule.py

@@ -58,7 +58,7 @@ def track_data_hook_calls(fn):
     - When ``dm.prepare_data()`` is called, ``dm.has_prepared_data`` gets set to True
     - When ``dm.setup()``, ``dm.has_setup_{fit,validate,test}`` get set to True
     - When ``dm.setup(stage)`` is called, where stage is any of ``{fit,validate,test,predict}``.
-        Its corresponding `dm_has_setup_{stage}` attribute gets set to True
+      Its corresponding `dm_has_setup_{stage}` attribute gets set to True
     - ``dm.teardown()`` and ``dm.teardown(stage)`` act exactly like ``dm.setup``
 
     Args:
@@ -319,11 +319,12 @@ class LightningDataModule(CheckpointHooks, DataHooks, metaclass=_DataModuleWrapp
 
         Args:
             args: The parser or namespace to take arguments from. Only known arguments will be
-             parsed and passed to the :class:`LightningDataModule`.
+                parsed and passed to the :class:`LightningDataModule`.
             **kwargs: Additional keyword arguments that may override ones in the parser or namespace.
-             These must be valid DataModule arguments.
+                These must be valid DataModule arguments.
 
         Example::
+
             parser = ArgumentParser(add_help=False)
             parser = LightningDataModule.add_argparse_args(parser)
             module = LightningDataModule.from_argparse_args(args)