baremetal: Clarify install config needs to be hand-written in the docs

[zeenix]

A minor improvement to baremetal UPI docs.

[abhinavdahiya]

/approve
/lgtm

/test all

[abhinavdahiya]

doc update, adding valid-bugzilla label.

[openshift-ci-robot]

@abhinavdahiya: The specified target(s) for /test were not found.
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/approve
/lgtm

/test all

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[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abhinavdahiya

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[abhinavdahiya]

/lgtm