Fix typo in fibonacci snippet

[jucke]

Fix typo in fibonacci snippet

Description

Change apoend to append in documentation/description.

What does your PR belong to?

• [ ] Website
• [x] Snippets
• [ ] General / Things regarding the repository (like CI Integration)

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] Enhancement (non-breaking improvement of a snippet)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have checked that the changes are working properly
• [x] I have checked that there isn't any PR doing the same
• [x] I have read the CONTRIBUTING document.

[Chalarangelo]

Thanks for the fix, merging right away!

[lock[bot]]

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