Adjust/Add to Set Up Local Previews guide (#71)

Author: devalog

fern/products/sdks/guides/setup-local-sdk-previews.mdx

@@ -1,29 +1,42 @@
 ---
-title: Setup local SDK previews
-subtitle: Use Fern's CLI tool to preview your SDK locally.
+title: Set up local SDK previews
+description: Use Fern's CLI tool to preview your SDK locally.
 ---
 
-[Once you configure your SDK](/learn/sdks/getting-started/generate-your-first-sdk), you can preview the generated SDK code using Fern's CLI.
+Once you configure your SDK, you can use the `--preview` flag to test generated
+SDK code locally before publishing. This allows quick iteration on your Fern definition
+as you develop:
 
-Simply append the `--preview` flag to the command used to generate the SDK and you will see the generated code populated in a `.preview` folder within your `fern` folder.
+```bash
+# Preview all SDKs
+fern generate --preview
 
-<Tip title="Custom Code">
-  [If you have added custom code to your SDK](/learn/sdks/capabilities/augment-with-custom-code), `--preview` will
-  preserve those changes.
+# Preview SDK for a specific language
+fern generate --group <language>-sdk --preview
+
+```
+
+`--preview` generates your SDK code into a local `.preview/` folder within your
+`fern` folder. No changes are published to package managers or GitHub. 
+
+<Tip>
+  `--preview` preserves any custom code you added to your SDK.
 </Tip>
 
-Here's an example of how you can preview your SDK:
+## Example usage
+
+Here's an example of how you can preview a Python SDK. 
 
 <Steps>
 ### Generator configuration
-```yaml generators.yml
+```yaml title="generators.yml" {4}
 api: 
   path: ./path/to/openapi.yml
 groups:
   python-sdk:
     generators:
       - name: fernapi/fern-python-sdk
-        version: 3.0.0
+        version: <Markdown src="/snippets/version-number.mdx"/>
         output:
           location: pypi
           package-name: imdb