Doc changes for health indicators
Doc changes for health indicators

When multiple binders are present in the classpath and not all of them are used,
there are some subtle details that the user needs to be aware. Addressing them
through docs by providing the details.

Resolves #1620
Resolves #1624

garyrussell/spring-cloud-stream,garyrussell/spring-cloud-stream,spring-cloud/spring-cloud-stream,ilayaperumalg/spring-cloud-stream,spring-cloud/spring-cloud-stream,spring-cloud/spring-cloud-stream,ilayaperumalg/spring-cloud-stream,garyrussell/spring-cloud-stream