Correct default shell docs for npm on Windows (#6078)

Author: Initial-heart-1

docs/npm.md

@@ -97,7 +97,7 @@ code-server
 # Now visit http://127.0.0.1:8080. Your password is in ~/.config/code-server/config.yaml
 ```
 
-A `postinstall.sh` script will attempt to run. Select your terminal (e.g., Git bash) as the default application for `.sh` files. If an additional dialog does not appear, run the install command again.
+A `postinstall.sh` script will attempt to run. Select your terminal (e.g., Git bash) as the default shell for npm run-scripts. If an additional dialog does not appear, run the install command again.
 
 If the `code-server` command is not found, you'll need to [add a directory to your PATH](https://www.architectryan.com/2018/03/17/add-to-the-path-on-windows-10/). To find the directory, use the following command: