Clarify bundle meaning

Author: dsyer

spring-grpc-spring-boot-autoconfigure/src/main/java/org/springframework/grpc/autoconfigure/server/GrpcServerProperties.java

@@ -362,7 +362,7 @@ public static class Ssl {
 		private ClientAuth clientAuth = ClientAuth.NONE;
 
 		/**
-		 * SSL bundle name.
+		 * SSL bundle name. Should match a bundle configured in spring.ssl.bundle.
 		 */
 		private String bundle;