[docs] [issue21333] Document recommended exception for objects that shouldn't be pickled

Michael Crouch added the comment:

When pickling an object fails on line 70 of copy_reg.py, a "TypeError" is raised. However, according to section 11.1.3 of the Standard Library documentation, when an unpicklable object is passed to the dump() method the "PicklingError" exception will be raised.

---------- components: +Library (Lib) -Documentation nosy: +Michael Crouch versions: +Python 2.7 -Python 3.5

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