log-levels: Update message to correct class name (#2732)

Author: IsaacG

exercises/concept/log-levels/src/main/java/LogLevels.java

@@ -1,14 +1,14 @@
 public class LogLevels {
 
     public static String message(String logLine) {
-        throw new UnsupportedOperationException("Please implement the (static) LogLine.message() method");
+        throw new UnsupportedOperationException("Please implement the (static) LogLevels.message() method");
     }
 
     public static String logLevel(String logLine) {
-        throw new UnsupportedOperationException("Please implement the (static) LogLine.logLevel() method");
+        throw new UnsupportedOperationException("Please implement the (static) LogLevels.logLevel() method");
     }
 
     public static String reformat(String logLine) {
-        throw new UnsupportedOperationException("Please implement the (static) LogLine.reformat() method");
+        throw new UnsupportedOperationException("Please implement the (static) LogLevels.reformat() method");
     }
 }