docs(ray): Update kuberay documentation

[MortalHappiness]

Tracking issue

N/A

Why are the changes needed?

The newest documentation for Ray Kubernetes plugin setup is not correct.

What changes were proposed in this pull request?

• The kuberay-operator version should be 1.1.0
• Remove the rbac part because the kuberay helm chart already deals with them.

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.06%. Comparing base (f1c2231) to head (e2bd871).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5179   +/-   ##
=======================================
  Coverage   59.06%   59.06%           
=======================================
  Files         646      646           
  Lines       55714    55714           
=======================================
  Hits        32910    32910           
  Misses      20208    20208           
  Partials     2596     2596           

Flag	Coverage Δ
unittests	59.06% <ø> (ø)

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