[docs] Vocabulary: Using "integral" in library/stdtypes.html (issue 26512)

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https://bugs.python.org/review/26512/diff/16736/Doc/library/stdtypes.rst
File Doc/library/stdtypes.rst (right):

https://bugs.python.org/review/26512/diff/16736/Doc/library/stdtypes.rst#newcode373
Doc/library/stdtypes.rst:373: | ``math.floor(x)``  | the greatest
integral float <= *x*          |
For Python 3:

the greatest integer <= *x*

or

the greatest :class:`numbers.Integral` <= *x*

https://bugs.python.org/review/26512/