Update documentation to use `sagemaker-python-sdk` as opposed to `sagemaker`

**What did you find confusing? Please describe.**
Your documentation suggests we use` pip install sagemaker`, as opposed to `pip install sagemaker-python-sdk`

This is confusing because your conda forge channel for sagemaker stopped being upgraded at 2.198.0 while sagemaker-python-sdk continues on to 2.241.0. This seems like a bug/ miss in your documentation

**Describe how documentation can be improved**
Update all documentation to refer to
sagemaker-python-sdk

**Additional context**
I've had bugs in my dependency management because the old 'sagemaker' forge tries to pull exceedingly old and outdated versions of your CLI, breaking compatibility with current packages and breaking builds

`# conda
conda create -n sagemaker python=3.7
conda activate sagemaker
conda install sphinx=3.1.1 sphinx_rtd_theme=0.5.0
`

Links:

Outdated, should be removed: https://anaconda.org/conda-forge/sagemaker

Should update documentation to refer to this:
https://anaconda.org/conda-forge/sagemaker-python-sdk

Cerca nella documentazione `pip install sagemaker`, `sagemaker-python-sdk` e i riferimenti collegati ai pacchetti conda. Aggiorna le istruzioni di installazione pertinenti in modo che utilizzino `sagemaker-python-sdk` e rimuovi o sostituisci il link obsoleto di conda-forge; il lavoro è completato quando la documentazione rimanda in modo coerente al pacchetto corrente.

Scritto dal modello di indicizzazione a partire dal testo della issue.