Update contributing doc

Author: davelopez

docs/CONTRIBUTING.md

@@ -156,10 +156,11 @@ If you are using `Windows` we recommend installing and using [WSL](https://docs.
 8. Submit a pull request through the GitHub website.
 
 ### Setup Visual Studio Code for debugging
-If you want to debug the [extension](../client) and the [Language Server](../server) at the same time, follow these steps:
-1. Open the `galaxy-tool-extension` directory in Visual Studio Code
-2. Open debug view (`ctrl + shift + D`)
-3. Select `Server + Client` and press `F5`
+If you want to debug the [extension](../client) and the [Language Server](../server) at the same time follow these steps:
+1. Select or activate your ``<environment-name>`` in Visual Studio Code as explained [here](https://code.visualstudio.com/docs/python/environments#_select-and-activate-an-environment).
+2. Open the `galaxy-language-server` directory in Visual Studio Code.
+3. Open debug view (`ctrl + shift + D`).
+4. Select `Server + Client` and click ``RUN`` (or press `F5`).
 
 ## Pull Request Guidelines