8251182: Fix "no comment" warnings in java.naming

Reviewed-by: lancea, rriggs, dfuchs

src/java.naming/share/classes/javax/naming/spi/NamingManager.java

@@ -948,6 +948,10 @@ public class NamingManager {
         return (answer != null) ? answer : obj;
     }
 
+    /**
+     * Thrown when an error is encountered while loading and instantiating the
+     * context factory classes.
+     */
     private static class FactoryInitializationError extends Error {
         @java.io.Serial
         static final long serialVersionUID = -5805552256848841560L;