add trailing newline to usage template #2780
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Followup fix for #2733 for proper
fly helpoutput.Note the original the default cobra
UsageTemplatewe used as a source includes a trailing newline:https://github.com/spf13/cobra/blob/fd865a44e3c48afeb6a6dbddadb8a5519173e029/command.go#L567-L568