[Doc] Auto sign-off for VSCode (#20132)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

Author: DarkLight1337

docs/contributing/README.md

@@ -152,9 +152,12 @@ the terms of the DCO.
 Using `-s` with `git commit` will automatically add this header.
 
 !!! tip
-    If you develop using PyCharm, there is a `Show Commit Options` icon to the right of the `Commit and Push...` button in the `Commit` window.
-    Opening it will bring up a `git` window where you can modify the `Author` and enable `Sign-off commit`.
-    This ensures that all your commits are automatically signed-off by PyCharm.
+    You can enable automatic sign-off via your IDE:
+  
+    - **PyCharm**: Click on the `Show Commit Options` icon to the right of the `Commit and Push...` button in the `Commit` window.
+      It will bring up a `git` window where you can modify the `Author` and enable `Sign-off commit`.
+    - **VSCode**: Open the [Settings editor](https://code.visualstudio.com/docs/configure/settings)
+      and enable the `Git: Always Sign Off` (`git.alwaysSignOff`) field.
 
 ### PR Title and Classification