Ruby Hamming about deprecated-mentors

[emcoding]

I changed it to Array#each when I made the other changes to Hamming #61
So I'll close this, please reopen if the discussion needs to be continued.
(cc @kotp @JoelQ)

[emcoding]

I'd vote for just change it to Array#each, and not to expand on it. Okay?

[JoelQ]

Good point about Enumerable#each!

I like @F3PiX's suggestion. In the context of hamming, it's generally Array#each that's used (although occasionally I see Range#each or Enumerator#each).

An alternatively might be to used an unprefixed #each.

In all cases, I think adding an explanation of how Enumerable works is probably out of scope for the mentor guide.