Docs: Fix formatting issues in the rendering docs (#54517)

docs/01-getting-started/index.mdx

@@ -0,0 +1,4 @@
+---
+title: Getting Started
+description: Learn how to create full-stack web applications with Next.js.
+---

docs/02-app/01-building-your-application/02-data-fetching/02-patterns.mdx

@@ -1,6 +1,5 @@
 ---
 title: Data Fetching Patterns
-nav_title: Patterns
 description: Learn about common data fetching patterns in React and Next.js.
 ---
 

docs/02-app/01-building-your-application/03-rendering/02-client-components.mdx

@@ -90,7 +90,7 @@ Then, on the client:
 3. The JavaScript instructions are used to [hydrate](https://react.dev/reference/react-dom/client/hydrateRoot) Client Components and make their UI interactive.
 
 > **What is hydration?**
-
+>
 > Hydration is process of attaching event listeners to the DOM, to make the static HTML interactive. Behind the scenes, hydration is done with the [`hydrateRoot`](https://react.dev/reference/react-dom/client/hydrateRoot) React API.
 
 ### Subsequent Navigations

docs/02-app/01-building-your-application/03-rendering/03-composition-patterns.mdx

@@ -1,6 +1,6 @@
 ---
 title: Server and Client Composition Patterns
-nav_title: Patterns
+nav_title: Composition Patterns
 description: Recommended patterns for using Server and Client Components.
 ---
 
@@ -346,9 +346,9 @@ You can optimize your package by using ['use client' deeper in the tree](#moving
 
 It's worth noting some bundlers might strip out `"use client"` directives. You can find an example of how to configure esbuild to include the `"use client"` directive in the [React Wrap Balancer](https://github.com/shuding/react-wrap-balancer/blob/main/tsup.config.ts#L10-L13) and [Vercel Analytics](https://github.com/vercel/analytics/blob/main/packages/web/tsup.config.js#L26-L30) repositories.
 
-### Client Components
+## Client Components
 
-#### Moving Client Components Down the Tree
+### Moving Client Components Down the Tree
 
 To reduce the Client JavaScript bundle size, we recommend moving Client Components down your component tree.
 
@@ -463,7 +463,7 @@ export default function ClientComponent({ children }) {
 }
 ```
 
-#### Supported Pattern: Passing Server Components to Client Components as Props
+### Supported Pattern: Passing Server Components to Client Components as Props
 
 The following pattern is supported. You can pass Server Components as a prop to a Client Component.