New Function: array flat(), 02-array/15_array-flat.md #51

[0xkafkaa]

Added the documentation for the flat method.

• [x] Create the file with the proper name
• [x] Create the documentation of the function
• [x] Write example in examples directory
• [x] Execute bun run format-examples-bun or npm run format-examples
• [x] Commit and open the PR

Regards, 0xkafkaa.

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Name	Status	Preview	Comments	Updated (UTC)
some-drops-of-javascript	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 23, 2024 10:51am

[roberto-butti]

Thank you @0xkafkaa , this is a great PR, very clear chapter ad good examples. Thank you for your contribution

It closes #51