🌱 docs(footer): Add trademark disclaimer

[mariasalcedo]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
Adds correct trademark disclaimer, as part of our ongoing effort to cncf/techdocs#198

Which issue(s) this PR fixes:
Fixes #2735

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mariasalcedo
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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @mariasalcedo. Thanks for your PR.

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[mikemorris]

Looks reasonable to me, thanks for taking care of this @mariasalcedo!

/ok-to-test
/lgtm

[mariasalcedo]

@mikemorris Thanks! Please add the approved label to be able to merge it.

[robscott]

Thanks @mariasalcedo! Unfortunately we're going to need to hold off on merging this until cncf/foundation#809 is resolved.

/hold

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[youngnick]

LGTM pending resolution of the license question.