update github integration section based on testing

Author: devalog

fern/products/sdks/overview/typescript/publishing-to-npm.mdx

@@ -10,7 +10,7 @@ Publish your public-facing Fern Typescript SDK to the [npm registry](https://www
 ## Configure your GitHub integration
 
   1.   Create a new GitHub repository for your SDK, if you haven't done so already.
-  1.   Install the [Fern GitHub App](https://github.com/apps/fern-api) on your repository.
+  1.   Install the [Fern GitHub App](https://github.com/apps/fern-api). Select **Configure**, then scroll down to **Repository Access**. Select **Only select repositories** and in the dropdown select the repository for your SDK. Click **Save**. 
   1.   Add your TypeScript SDK files (`fern` and `sdks` folders) to your repository.