momo-jun commented on code in PR #16204:
URL: https://github.com/apache/pulsar/pull/16204#discussion_r905659503
##########
site2/docs/concepts-messaging.md:
##########
@@ -174,16 +189,16 @@ Messages are received from
[brokers](reference-terminology.md#broker) either syn
Client libraries provide listener implementation for consumers. For example,
the [Java client](client-libraries-java) provides a {@inject:
javadoc:MesssageListener:/client/org/apache/pulsar/client/api/MessageListener}
interface. In this interface, the `received` method is called whenever a new
message is received.
-### Acknowledgement
+### acknowledgment
Review Comment:
```suggestion
### Acknowledgment
```
The first letter should be capitalized in a heading.
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