404 error in provided Performance article link in Dig Deeper section of Nucleotide Count exercise

Hi, as in title, in Dig Deeper section of Nucleotide Count we have a link to a performance article with if/switch benchmarks. However, when you click on the link, you receive:

404
Page not found
Looks like we can’t find that page. Sorry!

Looks like nucleotide-count is misspelled in the links inside https://github.com/exercism/go/tree/main/exercises/practice/nucleotide-count/.approaches/introduction.md if you would like to submit a PR for the fixes.

Fixed in this PR: