Sync docs and metadata to sync with with problem-specifications

[jagdish-15]

This PR updates the documentation and metadata for all exercises to align with the latest changes from the problem-specifications repository.

Additionally, there is a minor update in the test descriptions for the Flatten Array exercise. However, the implementation remains unchanged, as discussed in this forum thread.

Proof of Sync

PS C:\Programming\Exercism\python> ./bin/configlet.exe sync -u   
Updating cached 'problem-specifications' data...
Checking exercises...
Every exercise has up-to-date docs, filepaths, metadata, and tests!

[github-actions]

Hello. Thanks for opening a PR on Exercism 🙂

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[BethanyG]

Hi @jagdish-15,

As stated in the repo README, this track is closed to community contributions. The maintainers sync the exercises about once a month, and the March sync hasn't happened yet.

[jagdish-15]

@BethanyG, thank you for letting me know! I was contributing to the Java, JavaScript, and C tracks, and I assumed that community contributions were the default for all Exercism tracks. That was my misunderstanding, but I should have read the README.md first. I apologize for that!