Update configuration.mdx based on issue #266

Author: kgowru

fern/products/sdks/overview/python/configuration.mdx

@@ -20,49 +20,67 @@ groups:
 ## SDK Configuration Options
 
 <ParamField path="additional_init_exports" type="array" default="null" required={false} toc={true}>
+  Additional types to export in the package's __init__.py file.
 </ParamField>
 
 <ParamField path="client" type="ClientConfiguration" default="ClientConfiguration()" required={false} toc={true}>
+  Client-specific configuration options.
 </ParamField>
 
 <ParamField path="default_bytes_stream_chunk_size" type="number" default="null" required={false} toc={true}>
   The chunk size to use (if any) when processing a response bytes stream within `iter_bytes` or `aiter_bytes` results in: `for chunk in response.iter_bytes(chunk_size=<default_bytes_stream_chunk_size>):`
 </ParamField>
 
 <ParamField path="exclude_types_from_init_exports" type="bool" default="false" required={false} toc={true}>
+  Whether to exclude types from the package's __init__.py exports.
 </ParamField>
 
-<ParamField path="extra_dependencies" type="object" default="{}" required={false} toc={true}>
-  If you want to add custom dependencies to your generated SDK, you can specify them using this configuration. For example, to add a dependency on boto3, your config would look like:
+<ParamField path="extension_headers" type="object" default="{}" required={false} toc={true}>
+  Custom headers to include in every request made by the SDK client. For example:
+  ```yaml
+  config:
+    extension_headers:
+      x-fern-sdk-variables:
+        type: string
+        description: "Template variables to be replaced in paths"
   ```
+</ParamField>
+
+<ParamField path="extra_dependencies" type="object" default="{}" required={false} toc={true}>
+  Additional dependencies to include in the generated SDK package. For example:
+  ```yaml
   config:
     extra_dependencies:
       boto3: 1.28.15
   ```
 </ParamField>
 
 <ParamField path="extra_dev_dependencies" type="object" default="{}" required={false} toc={true}>
+  Additional development dependencies to include in the generated SDK package.
 </ParamField>
 
 <ParamField path="extras" type="object" default="{}" required={false} toc={true}>
+  Optional feature packages to include in the SDK.
 </ParamField>
 
 <ParamField path="flat_layout" type="bool" default="false" required={false} toc={true}>
+  Whether to generate a flat directory structure instead of nested resources.
 </ParamField>
 
 <ParamField path="follow_redirects_by_default" type="bool" default="true" required={false} toc={true}>
   Whether to follow redirects by default in HTTP requests.
 </ParamField>
 
 <ParamField path="improved_imports" type="bool" default="true" required={false} toc={true}>
-  Feature flag that improves imports in the Python SDK by removing nested `resources` directory
+  Feature flag that improves imports in the Python SDK by removing nested `resources` directory.
 </ParamField>
 
 <ParamField path="include_legacy_wire_tests" type="bool" default="false" required={false} toc={true}>
-  Whether or not to include legacy wire tests in the generated SDK
+  Whether to include legacy wire tests in the generated SDK.
 </ParamField>
 
 <ParamField path="include_union_utils" type="bool" default="false" required={false} toc={true}>
+  Whether to include utility functions for union types.
 </ParamField>
 
 <ParamField path="inline_path_params" type="bool" default="false" required={false} toc={true}>
@@ -74,20 +92,22 @@ groups:
 </ParamField>
 
 <ParamField path="package_name" type="string" default="null" required={false} toc={true}>
+  Custom package name for the generated SDK.
 </ParamField>
 
 <ParamField path="pydantic_config" type="SdkPydanticModelCustomConfig" default="SdkPydanticModelCustomConfig()" required={false} toc={true}>
+  Configuration options for Pydantic model generation.
 </ParamField>
 
 <ParamField path="pydantic_config.include_union_utils" type="bool" default="false" required={false} toc={true}>
   When enabled, the generator will output a Pydantic `__root__` class that will contain utilities to visit the union. For example, for the following union type:
 
-  ```
+  ```yaml
   types:
-  Shape:
-    union:
-      circle: Circle
-      triangle: Triangle
+    Shape:
+      union:
+        circle: Circle
+        triangle: Triangle
   ```
   you will get a generated `Shape` class that has a factory and visitor:
   ```python
@@ -97,8 +117,8 @@ groups:
   # Visit every case in the union
   shape = get_shape()
   shape.visit(
-    circle: lambda circle: do_something_with_circle(circle),
-    triangle: lambda triangle: do_something_with_triangle(triangle),
+    circle=lambda circle: do_something_with_circle(circle),
+    triangle=lambda triangle: do_something_with_triangle(triangle),
   )
   ```
 
@@ -125,30 +145,33 @@ groups:
 </ParamField>
 
 <ParamField path="pyproject_toml" type="string" default="null" required={false} toc={true}>
+  Custom pyproject.toml content for the generated package.
 </ParamField>
 
 <ParamField path="should_generate_websocket_clients" type="bool" default="false" required={false} toc={true}>
   Feature flag that enables generation of Python websocket clients.
 </ParamField>
 
 <ParamField path="skip_formatting" type="bool" default="false" required={false} toc={true}>
+  Whether to skip code formatting of the generated SDK.
 </ParamField>
 
 <ParamField path="timeout_in_seconds" type="number | 'infinity'" default="60" required={false} toc={true}>
   By default, the generator generates a client that times out after 60 seconds. You can customize this value by providing a different number or setting to `infinity` to get rid of timeouts.
 </ParamField>
 
 <ParamField path="use_api_name_in_package" type="bool" default="false" required={false} toc={true}>
+  Whether to include the API name in the generated package name.
 </ParamField>
 
 <ParamField path="use_inheritance_for_extended_models" type="bool" default="true" required={false} toc={true}>
   Whether to generate Pydantic models that implement inheritance when a model utilizes the Fern `extends` keyword.
 </ParamField>
 
 <ParamField path="use_typeddict_requests" type="bool" default="false" required={false} toc={true}>
-  Whether or not to generate `TypedDicts` instead of Pydantic Models for request objects.
+  Whether to generate `TypedDicts` instead of Pydantic Models for request objects.
 </ParamField>
 
 <ParamField path="use_typeddict_requests_for_file_upload" type="bool" default="false" required={false} toc={true}>
-  Whether or not to generate TypedDicts instead of Pydantic Models for file upload request objects. Note that this flag was only introduced due to an oversight in the `use_typeddict_requests` flag implementation; it should be removed in the future.
+  Whether to generate TypedDicts instead of Pydantic Models for file upload request objects. Note that this flag was only introduced due to an oversight in the `use_typeddict_requests` flag implementation; it should be removed in the future.
 </ParamField>