Remove the misleading property in documentation of spring-cloud-aws-rds.

Fixes spring-atticgh-355
Closes spring-atticgh-544

Author: SenthilPanneerselvam

docs/src/main/asciidoc/spring-cloud-aws.adoc

@@ -1717,10 +1717,6 @@ outlines all properties for a data source using `test` as the instance identifie
 |example
 |description
 
-|cloud.aws.rds.test
-|
-|The configuration property that configures a data source with the name test
-
 |cloud.aws.rds.test.password
 |verySecret
 |The password for the db instance test