Fix Pipeline docs formatting (#5283)

This commit fixes formatting issues around checkpointing
parameters for Python Pipeline class constructor that caused
the doc to not render correctly.

Signed-off-by: Krzysztof Lecki <klecki@nvidia.com>

dali/python/nvidia/dali/pipeline.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2017-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# Copyright (c) 2017-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -125,16 +125,13 @@ class Pipeline(object):
 
  More details can be found in
  `this documentation section <advanced_topics_checkpointing.html>`_.
-
-
  `checkpoint`: str, optional, default = None
  Serialized checkpoint, received from ``checkpoint`` method.
  When pipeline is built, its state is restored from the `checkpoint` and the pipeline
  resumes execution from the saved iteration.
 
  More details can be found in
  `this documentation section <advanced_topics_checkpointing.html>`_.
-
  `py_num_workers`: int, optional, default = 1
  The number of Python workers that will process ``ExternalSource`` callbacks.
  The pool starts only if there is at least one ExternalSource with ``parallel`` set to True.