add unit to documentation

packages/kit/src/exports/public.d.ts

@@ -431,7 +431,7 @@ export interface KitConfig {
 		errorTemplate?: string;
 	};
 	/**
-	 * Inline CSS inside a `<style>` block at the head of the HTML. This option is a number that specifies the maximum length of a CSS file to be inlined. All CSS files needed for the page and smaller than this value are merged and inlined in a `<style>` block.
+	 * Inline CSS inside a `<style>` block at the head of the HTML. This option is a number that specifies the maximum length of a CSS file in UTF-16 code units, as specified by the [String.length](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/length) property, to be inlined. All CSS files needed for the page and smaller than this value are merged and inlined in a `<style>` block.
 	 *
 	 * > This results in fewer initial requests and can improve your [First Contentful Paint](https://web.dev/first-contentful-paint) score. However, it generates larger HTML output and reduces the effectiveness of browser caches. Use it advisedly.
 	 * @default 0