Update docs for VSphere failure domain support

[rajeshvenkata]

Issue #, if available:
https://github.com/aws/eks-anywhere-internal/issues/2441

Description of changes:
This PR updates docs for VSphere failure domain support

Documentation added/planned (if applicable):

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.45%. Comparing base (deb58e7) to head (a37ff90).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9360   +/-   ##
=======================================
  Coverage   69.45%   69.45%           
=======================================
  Files         672      672           
  Lines       49357    49357           
=======================================
  Hits        34283    34283           
  Misses      13288    13288           
  Partials     1786     1786           

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[chrisnegus]

lgtm

[rajeshvenkata]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rajeshvenkata

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[rajeshvenkata]

/cherry-pick release-0.22

[eks-distro-pr-bot]

@rajeshvenkata: once the present PR merges, I will cherry-pick it on top of release-0.22 in a new PR and assign it to you.

In response to this:

/cherry-pick release-0.22

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[eks-distro-pr-bot]

@rajeshvenkata: new pull request created: #9364

In response to this:

/cherry-pick release-0.22

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.