docs: add details to updating vscode section

Author: jsjoeio

doc/CONTRIBUTING.md

@@ -2,14 +2,15 @@
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
 # Contributing
 
-- [Pull Requests](#pull-requests)
-- [Requirements](#requirements)
-- [Development Workflow](#development-workflow)
-  - [Updating VS Code](#updating-vs-code)
-- [Build](#build)
-- [Structure](#structure)
-  - [Modifications to VS Code](#modifications-to-vs-code)
-  - [Currently Known Issues](#currently-known-issues)
+- [Contributing](#contributing)
+  - [Pull Requests](#pull-requests)
+  - [Requirements](#requirements)
+  - [Development Workflow](#development-workflow)
+    - [Updating VS Code](#updating-vs-code)
+  - [Build](#build)
+  - [Structure](#structure)
+    - [Modifications to VS Code](#modifications-to-vs-code)
+    - [Currently Known Issues](#currently-known-issues)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 
@@ -58,10 +59,13 @@ To develop inside an isolated Docker container:
 
 ### Updating VS Code
 
-If you need to update VS Code, you can update the subtree with one line. Here's an example using the version 1.52.1
+If you need to update VS Code, you can update the subtree with one line. Here's an example using the version 1.52:
 
 ```shell
-git subtree pull --prefix lib/vscode vscode release/1.52 --squash --message "Update VS Code to 1.52.1"
+# Add vscode as a new remote if you haven't already and fetch
+git remote add -f vscode https://github.com/microsoft/vscode.git
+
+git subtree pull --prefix lib/vscode vscode release/1.52 --squash --message "Update VS Code to 1.52"
 ```
 
 ## Build