docs: fix wrong anchor in compiler-hooks.mdx

Author: wongest

src/content/api/compiler-hooks.mdx

@@ -54,7 +54,7 @@ compiler.hooks.someHook.tap('MyPlugin', (params) => {
 
 在编译器准备环境时调用，时机就在配置文件中初始化插件之后。
 
-### afterEnvironment $#afterEnvironment$
+### afterEnvironment $#afterenvironment$
 
 `SyncHook`