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Fix a typo in example_custom_operators

In the crossover function, the split point is chosen in the range of the offspring size, instead of the solution size. An out-of-range split point is silently ignored by the range selection: it selects all genes from parent1, and none from parent2. However, the error can be demonstrated by throwing an exception if the split point is out of range.

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`‎examples/example_custom_operators.py`

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Original file line number	Diff line number	Diff line change
`@@ -41,7 +41,7 @@ def crossover_func(parents, offspring_size, ga_instance):`
`41`	`41`	`parent1 = parents[idx % parents.shape[0], :].copy()`
`42`	`42`	`parent2 = parents[(idx + 1) % parents.shape[0], :].copy()`
`43`	`43`
`44`		`- random_split_point = numpy.random.choice(range(offspring_size[0]))`
	`44`	`+ random_split_point = numpy.random.choice(range(offspring_size[1]))`
`45`	`45`
`46`	`46`	`parent1[random_split_point:] = parent2[random_split_point:]`
`47`	`47`

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`‎examples/example_custom_operators.py`

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