Medium solution articles and challenge name confusion

[jdegand]

I don't know if you want bother updating all those articles vs adding a note in the docs about how not to worry about different titles in the articles and just match the challenge number. This is something that it didn't occur to me until the discussion about permissions was posted. If you were new to the repo and had no prior knowledge, you might overlook the challenge number and look for the previous challenge name and find it missing and get confused.