added description to switch-to-grafana-admin.sh

[ch-stark]

customers found this line confusion so added short description

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[sonarqubecloud[bot]]

Quality Gate passed

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0 New issues
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0.0% Coverage on New Code
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[openshift-merge-robot]

PR needs rebase.

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[openshift-ci[bot]]

@ch-stark: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/test-unit	edca99ef8c2b597cfe1a7e8a142edc5bbb338301	link	true	/test test-unit
ci/prow/test-e2e	edca99ef8c2b597cfe1a7e8a142edc5bbb338301	link	true	/test test-e2e

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