correct typo in programming playgrounds

[ghost]

What does this PR do?

Improve repo

For resources

Description

Correct a typo under the Python listings in programming playgrounds.
The 'repl' is named NiceDualPoint but in the file it was Repl.it - NiceDualPoin

Why is this valuable (or not)?

How do we know it's really free?

For book lists, is it a book? For course lists, is it a course? etc.

Checklist:

• Read our contributing guidelines
• Search for duplicates.
• Include author(s) and platform where appropriate.
• Put lists in alphabetical order, correct spacing.
• Add needed indications (PDF, access notes, under construction)

Follow-up

• Check the status of GitHub Actions and resolve any reported warnings!