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DOC:__trunc__ for scalars (#27789)

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	`1`	`+Add __trunc__ method to NumPy scalar types`
	`2`	`+==========================================`
	`3`	`+`
	`4`	+NumPy scalar floating and integer types now implement the ``__trunc__`` special method, matching Python’s built-in numeric types. This enables direct use of:func:`math.trunc` and the ``__trunc__`` dunder method on NumPy scalars:
	`5`	`+`
	`6`	`+Examples`
	`7`	`+--------`
	`8`	`+`
	`9`	`+..code-block::python`
	`10`	`+`
	`11`	`+>>>import numpyas np`
	`12`	`+>>>import math`
	`13`	`+>>> math.trunc(np.float16(np.pi))`
	`14`	`+3`
	`15`	`+>>> np.float16(-np.pi).__trunc__()`
	`16`	`+-3`
	`17`	`+>>> np.int32(42).__trunc__()`
	`18`	`+42`
	`19`	`+`
	`20`	`+Attempting to truncate infinite or NaN values for floating point types will now raise the same errors as Python floats.`
	`21`	`+`
	`22`	`+..versionadded::2.3`

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