doc: Fix import path of the PySparkProcessor

[gcbeltramini]

Issue #, if available: --

Description of changes:

• Fix import path of PySparkProcessor
• Fix typo

Testing done: Ran locally:

from sagemaker.spark.processing import PySparkProcessor
import sagemaker

print(sagemaker.__version__)  # 2.198.0

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[zhaoqizqwang]

Hi, as part of incoming PySDK V3 release, master branch will be replaced by PySDK V3 code. We have changed the target branch to master-v2