Update event-bus.md (#29979)

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Jabir S. Minjibir 2021-01-27 11:24:15 +01:00 committed by GitHub
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@ -43,7 +43,7 @@ The simplest classification is just to extract an arbitrary classifier from
each event and maintaining a set of subscribers for each possible classifier.
This can be compared to tuning in on a radio station. The trait
`LookupClassification` is still generic in that it abstracts over how to
compare subscribers and how exactly to classify.
compare subscribers and how exactly to classify them.
The necessary methods to be implemented are illustrated with the following example: