Update boots reference in baremetal docs

[ahreehong]

Issue #, if available:

Description of changes:
The tinkerbell boots service has been renamed to smee upstream. Update the docs to mention boots and smee refer to the same service.

Testing (if applicable):

Documentation added/planned (if applicable):

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.48%. Comparing base (9ffc26e) to head (3814b45).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8412   +/-   ##
=======================================
  Coverage   73.48%   73.48%           
=======================================
  Files         578      578           
  Lines       36489    36489           
=======================================
  Hits        26814    26814           
  Misses       7956     7956           
  Partials     1719     1719           

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[pokearu]

/lgtm

[ahreehong]

/approve
/cherry-pick release-0.20

[eks-distro-pr-bot]

@ahreehong: once the present PR merges, I will cherry-pick it on top of release-0.20 in a new PR and assign it to you.

In response to this:

/approve
/cherry-pick release-0.20

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[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahreehong

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[eks-distro-pr-bot]

@ahreehong: new pull request created: #8430

In response to this:

/approve
/cherry-pick release-0.20

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.