Note for more context

[haroonalbar]

Additional note on finding duplicate in array on pros and cons of using marking technique.

[spring1843]

Thanks for opening this PR. Although your note is correct:

• We don't add such comments to the code
• This technique has educational value, what you are describing could be a new problem. If you are interested please feel free to add that as a new problem in a new PR. It can be beneficial for readers to compare the two.

For these two reasons I'm gonna close this PR.

[haroonalbar]

Alright