Clarify that headers can be used to send beacons without data #1014
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Automatic beacons can be sent from an ad frame (without data) without invoking
setReportEventDataForAutomaticBeacons()
if the ad frame's page is served with the response headerAllow-Fenced-Frame-Automatic-Beacons: true
. We already mention that this is possible for component ads. This PR clarifies that this is also possible for main ad frames.