Fix array concatenation example in the documentation #244
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As mentioned in #243 by @yval1,
the array concatenation example is buggy, because we're copying the wrong amount of elements second time.
Initially I simply gave into the suggestion of simply correcting the mistake and using proper
source container, but after a little bit of thought I changed
copy
tocopy_backward
which doesn't leave much more error for bugs and is more descriptive.