Add missing quotation marks

[vincent-pli]

The missing quotation marks to correct the sample command.

Changes

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[tekton-robot]

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[tekton-robot]

This PR cannot be merged: expecting exactly one kind/ label

Available kind/ labels are:

kind/question: Issues or PRs that are questions around the project or a particular feature
kind/bug: Categorizes issue or PR as related to a bug.
kind/flake: Categorizes issue or PR as related to a flakey test
kind/cleanup: Categorizes issue or PR as related to cleaning up code, process, or technical debt.
kind/design: Categorizes issue or PR as related to design.
kind/documentation: Categorizes issue or PR as related to documentation.
kind/feature: Categorizes issue or PR as related to a new feature.
kind/misc: Categorizes issue or PR as a miscellaneuous one.

[vincent-pli]

/kind documentation

[vdemeester]

/lgtm

[tekton-robot]

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