clarify outputSourceFiles option

Author: devalog

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

@@ -338,9 +338,11 @@ No serialization/deserialization code is generated by default. The client uses `
 </ParamField>
 
 <ParamField path="outputSourceFiles" type="boolean" default="true" toc={true}>
-  When enabled, the generator outputs raw TypeScript files. When disabled (the default), outputs `.js` and `d.ts` files. 
+  Controls the output format of generated files:
+  - **When `true` (default)**: Outputs raw TypeScript `.ts` files
+  - **When `false`**: Runs TypeScript compiler and outputs compiled `.js` files with `.d.ts` declaration files
 
-  <Note>This only applies when dumping code locally. This configuration is ignored when publishing to Github or npm.</Note>
+  <Note>This option only applies when using local file system output. This setting is ignored when publishing to GitHub or npm, where files are always compiled.</Note>
 </ParamField>
 
 <ParamField path="packageJson" type="object" toc={true}>