Update the-filter-built-in-function.md

[Stefan-Stojanovic]

I have updated this question because when testing the code, the output was:

<filter object at 0x0000012E54DF0EE0>

Instead of: [-3,-2,-1]

I modified the example a little bit by saving the filtered result in a new variable and then printing the filtered result using a for loop.

[enki-hq]

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[enki-hq]

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