Fix doc typo

Author: snicoll

src/asciidoc/index.adoc

@@ -42155,7 +42155,7 @@ choices and message redelivery scenarios.
 | back-off
 | Specify the `BackOff` instance to use to compute the interval between recovery
   attempts. If the `BackOffExecution` implementation returns `BackOffExecution#STOP`,
-  the listener container will not further attempt to recover. The `recovery-interval
+  the listener container will not further attempt to recover. The `recovery-interval`
   value is ignored when this property is set. The default is a `FixedBackOff` with
   an interval of 5000 ms, that is 5 seconds.