Remove hard-coded list of values in description

Since the meta-data now provide an explicit support for value hints, we
should not copy/paste them in the description as the IDE is able to
process them any way it wants.

Closes gh-3863

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/ShellProperties.java

@@ -42,9 +42,8 @@ public class ShellProperties {
 	private static Log logger = LogFactory.getLog(ShellProperties.class);
 
 	/**
-	 * Authentication type (can be "simple", "spring", "key" or "jaas"). Auto-detected
-	 * according to the environment (i.e. if Spring Security is available, "spring" is
-	 * used by default).
+	 * Authentication type. Auto-detected according to the environment (i.e. if
+	 * Spring Security is available, "spring" is used by default).
 	 */
 	private String auth = "simple";