Update v2.md
Update v2.md

Fix example tickscript.

Executing the old example results in errors 

```invalid TICKscript: line X char Y: no method or property "teamsList" on *pipeline.OpsGenieHandler```

That is because https://github.com/influxdata/kapacitor/blob/master/services/opsgenie2/config.go#L18 lists the property as teams
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