Update setting-the-length-of-an-array.md

[Stefan-Stojanovic]

[enki-hq]

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[enki-hq]

Insight previews:

• [ ] enkidevs/curriculum/javascript/javascript-core/javascript-arrays/setting-the-length-of-an-array.md

[kapnobatai137]

@Stefan-Stojanovic what's left to do for this PR?

[Stefan-Stojanovic]

@Stefan-Stojanovic what's left to do for this PR?

I wasn't sure what to change based on sourabhs comment and was waiting on the reply