Documentation: CLI usage not updated

[oliversalzburg]

At https://code.visualstudio.com/docs/editor/command-line#_opening-files-and-folders the documentation reads:

Name of a folder to open. You can specify multiple folders and there will be an instance for each folder.

However, when doing so on 1.18, all supplied folders are opened into a single window, in a shared workspace.

I was originally searching for how to control this behavior, as the documented behavior is how it used to work.

[bpasero]

Moved to microsoft/vscode-docs#1264