chore: added an explanation on automl project envs (#5059)
chore: added an explanation on automl project envs (#5059)

## Description
Added some information about separate project of AUTOML


Fixes #3491 



GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples