Docs: Add warning against installing Ray in base environment

[MysteryManav]

Docs: Added warning in documentation against installing Ray in base environment #3082

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Any manual or new tests for this PR (please specify below)
• All smoke tests: pytest tests/test_smoke.py
• Relevant individual smoke tests: pytest tests/test_smoke.py::test_fill_in_the_name
• Backward compatibility tests: bash tests/backward_comaptibility_tests.sh

[MysteryManav]

@Michaelvll if you would, please take a look at it and notify for any additional changes

[concretevitamin]

For discussion: We may want to add a dedicated guide on how to use Ray as part of the user job. That page can use a tip like this. A full YAML example #3195 may help promote this recommendation more directly.

[Michaelvll]

Yes, let’s add a yaml example of starting a distributed job with ray as mentioned above. We can try to move it to a separate page later after this pr is merged.

[MysteryManav]

So for confirmation: I should add the command to run the example in distributed_ray_train, the one that uses FashionMNIST and add the command for tha yaml file and its output as example in the documentation ?

[Michaelvll]

Yes, we can add the yaml file inline with the command to run that yaml : )

[MysteryManav]

any more suggestions ?

[Michaelvll]

Thanks for fixing this @MysteryManav! Just left several comments.

[MysteryManav]

thankful for the opportunity and the guidance @Michaelvll

[Michaelvll]

Thanks for updating the doc @MysteryManav! This seems good to me as a basic version. We should probably have a more detailed explanation for those concept, e.g. the relationship with ray, etc.
cc'ing @concretevitamin for another look.

[concretevitamin]

Awesome, LGTM too @MysteryManav!

[MysteryManav]

@concretevitamin @Michaelvll commited a last suggestion just now

Thanks