docs: add license configuration examples for SDK generators

fern/products/sdks/overview/python/publishing-to-pypi.mdx

@@ -87,7 +87,7 @@ groups:
 	     You can add metadata to your PyPI package to improve discoverability and provide additional information to users. This metadata appears on your package's PyPI page and includes `keywords` for PyPI search and discovery, `documentation-link` for your package documentation, and `homepage-link` for your project homepage.
 
 
-```yaml title="generators.yml" {9-12}
+```yaml title="generators.yml" {9-13}
 groups: 
   python-sdk:
     generators:
@@ -100,6 +100,8 @@ groups:
             keywords: ["api", "sdk", "client"]
             documentation-link: "https://docs.yourcompany.com"
             homepage-link: "https://yourcompany.com"
+        metadata:
+          license: MIT
         config:
           client_class_name: YourClientName
 ```

fern/products/sdks/reference/generators-yml-reference.mdx

@@ -288,6 +288,7 @@ Package metadata like description and authors that gets included in all generate
 ```yaml title="generators.yml"
 metadata:
   description: "My API SDK"
+  license: MIT
   authors:
     - name: "John Doe"
       email: "[email protected]"
@@ -299,6 +300,10 @@ metadata:
   A brief description of the SDK that will be included in package metadata. This description helps users understand what your SDK does when they discover it in package repositories.
 </ParamField>
 
+<ParamField path="license" type="'MIT' | 'Apache-2.0'" required={false} toc={true}>
+  Software license for the generated SDK. Supported values are `MIT` or `Apache-2.0`. This populates the license field in package manifests (e.g., `pyproject.toml` for Python, `package.json` for TypeScript).
+</ParamField>
+
 ### `authors`
   A list of authors who will be credited in the generated SDK's package metadata.