polish

git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@1444 50f2f4bb-b051-0410-bef5-90022cba6387

org.springframework.context/src/main/java/org/springframework/ui/alert/Alerts.java

@@ -97,7 +97,7 @@ public final class Alerts {
 		}
 		
 		public String toString() {
-			return getSeverity() + ":" + getMessage();
+			return getSeverity() + ": " + getMessage();
 		}
 	}