Updated markdownOptions config type (#2826)

* Updated markdownOptions config type

* removed rehype-toc

packages/astro/src/@types/astro.ts

@@ -157,33 +157,41 @@ export interface AstroUserConfig {
 	/** @deprecated - Use "integrations" instead. Run Astro to learn more about migrating. */
 	renderers?: string[];
 
-	/**
-	 * @docs
-	 * @name markdownOptions
-	 * @type {{render: MarkdownRenderOptions}}
-	 * @see [Markdown guide](/en/guides/markdown-content/)
-	 * @description
-	 * Configure how markdown files (`.md`) are rendered.
-	 *
-	 * ```js
-	 * {
-	 *   markdownOptions: {
-	 *     // Add a Remark plugin to your project.
-	 *     remarkPlugins: [
-	 *       ['remark-autolink-headings', { behavior: 'prepend'}],
-	 *     ],
-	 *     // Add a Rehype plugin to your project.
-	 *     rehypePlugins: [
-	 *       'rehype-slug',
-	 *       ['rehype-autolink-headings', { behavior: 'prepend'}],
-	 *     ],
-	 *     // Customize syntax highlighting
-	 * 	   syntaxHighlight: 'shiki',
-	 *   },
-	 * }
-	 * ```
-	 */
-	/** Options for rendering markdown content */
+  /**
+   * @docs
+   * @name markdownOptions
+   * @type {{render: MarkdownRenderOptions}}
+   * @see [Markdown guide](/en/guides/markdown-content/)
+   * @description
+   * Configure how markdown files (`.md`) are rendered.
+   *
+   * ```js
+   * import { defineConfig } from "astro/config";
+   * import astroRemark from "@astrojs/markdown-remark";
+   * import customRehypePlugin from "/path/to/rehypePlugin.mjs";
+   *
+   * export default defineConfig({
+   *   // Enable Custom Markdown options, plugins, etc.
+   *   markdownOptions: {
+   *     render: [
+   *       // The Remark parser to parse Markdown content
+   *       astroRemark,
+   *       {
+   *         // Add a Remark plugin to your project.
+   *         remarkPlugins: ["remark-code-titles"],
+   *
+   *         // Add a Rehype plugin to your project.
+   *         rehypePlugins: [
+   *           "rehype-slug",
+   *           [customRehypePlugin, { configKey: "value" }],
+   *           ["rehype-autolink-headings", { behavior: "prepend" }],
+   *         ],
+   *       },
+   *     ],
+   *   },
+   * });
+   * ```
+   */
 	markdownOptions?: {
 		render?: MarkdownRenderOptions;
 	};