Update documentation references

[claudio4git]

On the site https://docs.cypress.io/guides/tooling/code-coverage there are these references that don't exist anymore.

1: https://www.semantics3.com/blog/understanding-code-coverage-1074e8fccce0/
2: https://www.semantics3.com/blog/understanding-javascript-code-coverage-part-2-9aedaa5119e5/

You can update to:
1: https://medium.com/engineering-semantics3/understanding-code-coverage-1074e8fccce0
2: https://medium.com/engineering-semantics3/understanding-javascript-code-coverage-part-2-9aedaa5119e5

They are the same.