Update readme to remove readthedocs reference temporarily (#5408)

Author: aviruthen

README.rst

@@ -33,8 +33,6 @@ You can also train and deploy models with **Amazon algorithms**,
 which are scalable implementations of core machine learning algorithms that are optimized for SageMaker and GPU training.
 If you have **your own algorithms** built into SageMaker compatible Docker containers, you can train and host models using these as well.
 
-For detailed documentation, including the API reference, see `Read the Docs <https://sagemaker.readthedocs.io>`_.
-
 To install SageMaker Python SDK, see `Installing SageMaker Python SDK <#installing-the-sagemaker-python-sdk>`_.
 
 ❗🔥 SageMaker V3 Release