[docs] [issue15474] Differentiate decorator and decorator factory in docs

[Ezio Melotti]

Ezio Melotti added the comment:

The tutorial doesn't seem to mention decorators, do you think this should be covered there?
FWIW while explaining decorators I usually use 3 examples:
 1) a simple decorator that accepts a function, does something, and returns the same function;
 2) a decorator that defines and returns an inner function;
 3) a decorator factory, that defines two nested inner functions

Not sure if it's necessary to include the first example though.

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