Application props in appendix not showing description

[onobc]

Note

Original issue: spring-projects/spring-pulsar#365
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@sobychacko Links below need to be updated to point to new location of binder docs (Spring Cloud docs)

Any config props that are @NestedConfigurationProperty whose type exists in another module do not show the description of the fields.

Example: https://github.com/spring-projects-experimental/spring-pulsar/blob/82f4fb512c741fa245d436112ebe2f2995ca6282/spring-pulsar-spring-cloud-stream-binder/src/main/java/org/springframework/pulsar/spring/cloud/stream/binder/properties/PulsarBinderConfigurationProperties.java#L35

Once spring-projects/spring-boot#18366 is fixed then this should just work. If there are any adjustments required from the Boot issue then those changes will be made in the scope of this ticket.

ℹ️ This only currently affect the Pulsar binder props as they point back to props in Pulsar auto-configure props (module).