Update ruby-numbers-methods/index.md with .next method

[ghost]

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[ChaituVR]

Hey @RyanDav

So I'd love to be able to merge your changes but it looks like you have some merge conflicts. ⚠️

Once you resolve these conflicts, I will be able to review your PR and merge it. 😊

---

If you're not familiar with the merge conflict process, feel free to look over GitHub's guide on "Resolving a merge conflict". 🔍️

Also, it's good practice on GitHub to write a brief description of your changes when creating a PR. 📝

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[Asjas]

Thank you for your contribution to the page! 👍
We're happy to accept these changes, and look forward to future contributions. 🎉

[ghost]

This was one of my first contributions to FCC and open source, encouraged by hacktoberfest. Its been cool to see my work accepted and hopefully the start of many more!
Ryan