PUBDEV-8091: Add to docs examples of getting baseline hazard, baseline survival, corcordance

[hannah-tillman]

For: https://h2oai.atlassian.net/browse/PUBDEV-8091

[neema-m]

@hannah-tillman , you current changes/additions will help for our current version. But @satai has a new PR that will call these functions much more easily for Python.

h2o.baseline_hazard_frame

# Get baseline survival
h2o.baseline_survival_frame

I don't see anything for R though. @satai, do you have one for R?

[satai]

R should be already pretty nice:

output <- coxph.h2o@model
output$baseline_survival

[hannah-tillman]

@satai @neemah2o Can either of you confirm this is now written in the correct format?

[michalkurka]

@hannah-tillman seems correct to me, thank you for making the changes!