[docs] Typo in doc

[Robert Rolf]

https://docs.python.org/2/library/stdtypes.html
5.4. Numeric Types — int
<https://docs.python.org/2/library/functions.html#int>, float
<https://docs.python.org/2/library/functions.html#float>, long
<https://docs.python.org/2/library/functions.html#long>, complex
<https://docs.python.org/2/library/functions.html#complex>¶
<https://docs.python.org/2/library/stdtypes.html#numeric-types-int-float-long-complex>
Should be "int, long, float, complex" to match description and ranking in
following discussion.

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