[docs] [issue19054] Descriptors howto

[Marco Buttu]

Marco Buttu added the comment:

Maybe is better to underline the difference between classes and non-classes objects, instead of between objects and classes, because a class is an object, so it could be confusing). 
Raymond, what do you think about rewriting this sentence:

  `The details of invocation depend on whether obj is an object or a class.`

as:

  `The details of invocation depend on whether obj is a class or not.`

I upload two new patches (one for py2 and the other for py3)

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Added file: http://bugs.python.org/file31828/py3howto.patch

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