feat: add docs for json schemas

src/content/docs/en/guides/content-collections.mdx

@@ -543,6 +543,37 @@ If you have an existing Astro project, such as a blog, that uses Markdown or MDX
 
 See how to convert a basic blog example from `src/pages/posts/` to `src/content/posts` in our [step-by-step tutorial](/en/tutorials/add-content-collections/) that uses the codebase from [the Build a Blog tutorial's finished project](https://github.com/withastro/blog-tutorial-demo).
 
+## Enabling JSON Schema Generation
+
+<p><Since v="4.13.0" /></p>
+
+If you are working with collections of type `data`, Astro will auto-generate JSON schema files for your editor to get IntelliSense and type-checking. A separate file will be created for each data collection in your project based on your collections defined in `src/content/config.ts` using a library called [zod-to-json-schema](https://github.com/StefanTerdell/zod-to-json-schema#known-issues).
+
+This feature requires you to manually set your schema's file path as the value for `$schema` in each data entry file of the collection:
+
+```json title="src/content/authors/armand.json" ins={2}
+{
+  "$schema": "../../../.astro/collections/authors.schema.json",
+  "name": "Armand",
+  "skills": ["Astro", "Starlight"]
+}
+```
+
+Alternatively, you can set this value in your editor settings. For example, to set this value in [VSCode's `json.schemas` setting](https://code.visualstudio.com/docs/languages/json#_json-schemas-and-settings), provide the path of files to match and the location of your JSON schema:
+
+```json
+{
+  "json.schemas": [
+  {
+    "fileMatch": [
+      "/src/content/authors/**"
+    ],
+    "url": "./.astro/collections/authors.schema.json"
+  }
+  ]
+}
+```
+
 ## Enabling Build Caching
 
 <p><Since v="3.5.0" /><Badge class="neutral-badge" text="Experimental" /></p>