fixing chart description wording

[bschlaman]

minor wording fix in TEK publish metrics chart description

[google-oss-robot]

Hi @bschlaman. Thanks for your PR.

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[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bschlaman, whaught

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[whaught]

/ok-to-test