Small README improvements

Readme.md

@@ -26,7 +26,7 @@ Read this in other languages: English | [简体中文](./Readme_zh-CN.md)
     - [Custom argument processing](#custom-argument-processing)
     - [Action handler](#action-handler)
     - [Stand-alone executable (sub)commands](#stand-alone-executable-subcommands)
-  - [Life cycle hooks](#life-cycle-hooks)
+    - [Life cycle hooks](#life-cycle-hooks)
   - [Automated help](#automated-help)
     - [Custom help](#custom-help)
     - [Display help from code](#display-help-from-code)
@@ -555,11 +555,11 @@ program.parse(process.argv);
 
 If the program is designed to be installed globally, make sure the executables have proper modes, like `755`.
 
-## Life cycle hooks
+### Life cycle hooks
 
 You can add callback hooks to a command for life cycle events.
 
-Example file: [hook](./examples/hook.js)
+Example file: [hook.js](./examples/hook.js)
 
 ```js
 program