Add codeActionsOnSave to docs by gunadhya · Pull Request #3938 · microsoft/vscode-docs

Do you guys think it is possible to retain the part where you explain the reason why one should prefer using an array over an object ?? 

You can also set editor.codeActionsOnSave to an array of Code Actions to execute in order. You can use this to guarantee that a specific Code Action is always run before or after another one that may conflict with it.
The following editor.codeActionsOnSave will always run Organize Imports followed by Fix All once organize imports finishes:

"editor.codeActionsOnSave": [	
    "source.organizeImports",	
    "source.fixAll"	
]