Improve Contribution Guide's VSCode setup instructions (fastify#4594)

* add info on vscode settings and link to vscode docs

* fix: add vscode setting recomendation

---------

Co-authored-by: Evelyn Pirnia <[email protected]>

Author: evpirnia

docs/Guides/Contributing.md

@@ -162,9 +162,11 @@ the left sidebar. But wait! We are not quite done yet. There are a few more
 baseline settings that should be set before VSCode is ready.
 
 Press `cmd+shift+p` to bring up the VSCode command input prompt. Type `open
-settings (json)` and then choose the same item from the filtered menu. This will
-open a document that is the settings for the editor. Paste the following JSON
-into this document, overwriting any text already present, and save it:
+settings (json)`. Three [VSCode Setting](https://code.visualstudio.com/docs/getstarted/settings)
+options will appear in the dropdown: Workspace, Default,
+and User settings. We recommend selecting Default. This will open a document
+that is the settings for the editor. Paste the following JSON into this
+document, overwriting any text already present, and save it:
 
 ```json
 {