fix docs for TargetSpace.random_sample

[ytzfhqs]

The example sampling results in the comments of the random_sample() function in the target_space.py file may have been written backwards.

Examples
        --------
        >>> target_func = lambda p1, p2: p1 + p2
        >>> pbounds = {'p1': (0, 1), 'p2': (1, 100)}
        >>> space = TargetSpace(target_func, pbounds, random_state=0)
        >>> space.random_sample()
        array([[ 55.33253689,   0.54488318]])

It should be amended to:

Examples
        --------
        >>> target_func = lambda p1, p2: p1 + p2
        >>> pbounds = {'p1': (0, 1), 'p2': (1, 100)}
        >>> space = TargetSpace(target_func, pbounds, random_state=0)
        >>> space.random_sample()
        array([[0.54488318 ,   55.33253689]])

The example may mislead users.

[till-m]

Thanks for your contribution!