Rewriting description to align with code and video

[hollowcrust]

Description

I rewrite the description of Floyd Cycle Detection Algorithm to align with the C++ and C code snippets and the video given, and give step-by-step illustration of how the algorithm works in the example.

Fixes #122

Checklist

• [x] A description of the changes in this PR is mentioned above.
• [x] All the new and existing checks pass.
• [x] No plagiarized, duplicated, or repetitive documentation that has been directly copied from another source.
• [x] If it's a new explanation, it contains solid, understandable, and accessible information.
• [x] I have read the whole contributing guidelines and agree to the Code of Conduct.

Screenshots (if any)

Note to reviewers

[hollowcrust]

Thanks a lot!

[appgurueu]

Thanks a lot!

Thank you for your PR :)

[github-actions[bot]]

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