Updating cluster workflow docs to add bare metal

[chrisnegus]

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Description of changes: Updating the cluster workflow description in the concepts section to add the Bare Metal workflow to the existing vSphere descriptions.

This is now ready for review!

[codecov[bot]]

Codecov Report

Merging #2625 (874a7f0) into main (72414be) will increase coverage by 0.41%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2625      +/-   ##
==========================================
+ Coverage   64.06%   64.47%   +0.41%     
==========================================
  Files         348      353       +5     
  Lines       27605    28068     +463     
==========================================
+ Hits        17685    18098     +413     
- Misses       8615     8657      +42     
- Partials     1305     1313       +8     

Impacted Files	Coverage Δ
pkg/diagnostics/analyzers.go	72.58% <0.00%> (-6.93%)	:arrow_down:
pkg/providers/tinkerbell/stack/stack.go	81.18% <0.00%> (-3.03%)	:arrow_down:
pkg/dependencies/factory.go	67.79% <0.00%> (-0.25%)	:arrow_down:
pkg/cluster/spec.go	64.38% <0.00%> (ø)
pkg/validations/errors.go	0.00% <0.00%> (ø)
pkg/providers/vsphere/setupuser/validator.go	100.00% <0.00%> (ø)
pkg/workflow/error.go	100.00% <0.00%> (ø)
pkg/workflow/workflow.go	100.00% <0.00%> (ø)
pkg/workflow/context.go	0.00% <0.00%> (ø)
...rnal/aws-sdk-go-v2/internal/endpoints/endpoints.go	85.22% <0.00%> (ø)
... and 5 more

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[chrisnegus]

/cherry-pick release-0.11

[eks-distro-pr-bot]

@chrisnegus: once the present PR merges, I will cherry-pick it on top of release-0.11 in a new PR and assign it to you.

In response to this:

/cherry-pick release-0.11

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[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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[eks-distro-pr-bot]

@chrisnegus: new pull request created: #3319

In response to this:

/cherry-pick release-0.11

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.