checkstyle fix

Signed-off-by: David Kral <david.k.kral@oracle.com>

config/config/src/main/java/io/helidon/config/DeprecatedConfig.java

@@ -62,6 +62,16 @@ public static Config get(Config config, String currentKey, String deprecatedKey)
         }
     }
 
+    /**
+     * Get a value from config, attempting to read both the keys.
+     * Warning is logged if either the current key is not defined, or both the keys are defined.
+     *
+     * @param config configuration instance
+     * @param currentKey key that should be used
+     * @param deprecatedKey key that should not be used
+     *
+     * @return config node of the current key if exists, of the deprecated key if it does not, missing node otherwise
+     */
     public static io.helidon.common.config.Config get(io.helidon.common.config.Config config,
                                                       String currentKey,
                                                       String deprecatedKey) {