Add section about how the spec uses an underscore prefix (`_producer`) to distinguish facet properties from top-level properties (`producer`). The same goes for `schemaURL`. See this thread in Slack: https://openlineage.slack.com/archives/C01CK9T7HKR/p1682904947957759
Add section about how the spec uses an underscore prefix (
_producer) to distinguish facet properties from top-level properties (producer). The same goes forschemaURL. See this thread in Slack: https://openlineage.slack.com/archives/C01CK9T7HKR/p1682904947957759