Update index.d.ts

fix typo

Author: kaibolay

packages/remote-config-types/index.d.ts

@@ -22,7 +22,7 @@ export interface RemoteConfig {
   settings: Settings;
 
   /**
-   * Object containing default values for conigs.
+   * Object containing default values for configs.
    */
   defaultConfig: { [key: string]: string | number | boolean };