[docs] 9.5.1. Multiple Inheritance

[Julien Poissonnier]

Minor error in http://docs.python.org/tutorial/classes.html#multiple-inheritance, 9.5.1. Multiple Inheritance:
Last paragraph, first sentence has an extra "one"
"(where one at least one of the parent classes can be accessed through multiple paths from the bottommost class)"
should be
"(where at least one of the parent classes can be accessed through multiple paths from the bottommost class)"