System.Windows.Forms.Form missing event hierarchy descriptions

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Starting from the fact that, not calling the `base.OnLoad()` method in classes derived from the [System.Windows.Forms.Form](https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.form) class, a whole bunch of events does not get raised either, gives lots of unexpected behaviors. I can and would expect for example that the Load event will not be raised when I override `OnLoad` and not call the base implementation, but I would never expect that the Shown event is also not raised in this situation. And who knows what other events are affected.

Current documentation is completely lacking those details. A detailed hierarchy of events and when they are raised/not raised from they base class implementations in the Form class would be very helpful.
The current note like "_When overriding OnLoad(EventArgs) in a derived class, be sure to call the base class's OnLoad(EventArgs) method so that registered delegates receive the event._" does not suffice because it also affects other events

Inizia con il riferimento all'API di System.Windows.Forms.Form e con la nota esistente su OnLoad(EventArgs). Esamina la documentazione correlata agli eventi di Form e identifica quali eventi dipendono dalle implementazioni della classe base. Il lavoro è completato quando il riferimento spiega la gerarchia degli eventi e quando gli override derivati devono chiamare l'implementazione della classe base.

Scritto dal modello di indicizzazione a partire dal testo della issue.