This is all the docs we have now:
 

"Allow a runtime class method to be initialized when a game is loaded at runtime without action from the user.
Methods marked {{[RuntimeInitializeOnLoadMethod]}} are invoked after the game has been loaded. This is after the {{Awake}} method has been invoked.

Note: The execution order of methods marked {{[RuntimeInitializeOnLoadMethod]}} is not guaranteed."

It does not mention the various options of callbacks

There is no info on the execution order of the callbacks.

Incorrect info:

• This is after the {{Awake}} method has been invoked.
• The execution order of methods marked {{[RuntimeInitializeOnLoadMethod]}} is not guaranteed.

The documentation was not updated when RuntimeInitializeLoadType was added. Which is hooks that invalidates above documenation.