i18n(ko-KR): update configuration-reference.mdx (#9192)

Co-authored-by: Yan <61414485+yanthomasdev@users.noreply.github.com>

src/content/docs/ko/reference/configuration-reference.mdx

@@ -1807,9 +1807,12 @@ Markdown, MDX 또는 Markdoc에서 생성된 항목은 `render()` 함수를 사
 ```astro title="src/pages/[slug].astro"
 ---
 import { getEntry, render } from 'astro:content';
+
 const post = await getEntry('blog', Astro.params.slug);
-const { Content, headings } = await render(entry);
+
+const { Content, headings } = await render(post);
 ---
+
 <Content />
 ```