refactor(docs): add heading to each utility

docs/3.api/4.advanced/2.kit.md

@@ -2027,35 +2027,45 @@ export default defineNuxtModule({
 
 [source code](https://github.com/nuxt/nuxt/blob/main/packages/kit/src/nitro.ts)
 
-- `addServerHandler (handler)`
-- `addDevServerHandler (handler)`
-- `useNitro()` (only usable after `ready` hook)
-- `addServerPlugin`
-- `addPrerenderRoutes`
+### `addServerHandler (handler)`
+
+### `addDevServerHandler (handler)`
+
+### `useNitro()` (only usable after `ready` hook)
+
+### `addServerPlugin`
+
+### `addPrerenderRoutes`
 
 ## Resolving
 
 [source code](https://github.com/nuxt/nuxt/blob/main/packages/kit/src/resolve.ts)
 
-- `resolvePath (path, resolveOptions?)`
-- `resolveAlias (path, aliases?)`
-- `findPath (paths, resolveOptions?)`
-- `createResolver (base)`
+### `resolvePath (path, resolveOptions?)`
+
+### `resolveAlias (path, aliases?)`
+
+### `findPath (paths, resolveOptions?)`
+
+### `createResolver (base)`
 
 ## Logging
 
 [source code](https://github.com/nuxt/nuxt/blob/main/packages/kit/src/logger.ts)
 
-- `useLogger(scope?)`
+### `useLogger(scope?)`
 
 ## Builder
 
 [source code](https://github.com/nuxt/nuxt/blob/main/packages/kit/src/build.ts)
 
-- `extendWebpackConfig(callback, options?)`
-- `extendViteConfig(callback, options?)`
-- `addWebpackPlugin(webpackPlugin, options?)`
-- `addVitePlugin(vitePlugin, options?)`
+### `extendWebpackConfig(callback, options?)`
+
+### `extendViteConfig(callback, options?)`
+
+### `addWebpackPlugin(webpackPlugin, options?)`
+
+### `addVitePlugin(vitePlugin, options?)`
 
 ## Examples