fix typo

src/server/service/config-loader.js

@@ -294,7 +294,7 @@ class ConfigLoader {
     };
 
     // In getConfig API, only null is used as a value to indicate that a config is not set.
-    // So, if a value loaded from the database is emtpy,
+    // So, if a value loaded from the database is empty,
     // it is converted to null because an empty string is used as the same meaning in the config model.
     // By this processing, whether a value is loaded from the database or from the environment variable,
     // only null indicates a config is not set.

src/server/service/config-manager.js

@@ -67,7 +67,7 @@ class ConfigManager {
   }
 
   /**
-   * get a config specified by namespace and regular expresssion
+   * get a config specified by namespace and regular expression
    */
   getConfigByRegExp(namespace, regexp) {
     const result = {};