Address not checksummed link is 404

[kitblake]

When inputting a non-checksummed address in MEW, a js error message appears at the bottom of the page:
(error_36) Input address is not checksummed. What does that mean?
"What does that mean?" is a link which 404s:
https://myetherwallet.github.io/knowledge-base/addresses/not-check
The correct URL is:
https://kb.myetherwallet.com/addresses/what-does-checksummed-mean.html

[gamalielhere]

Closing since it will be included in #2126. Changes should show up when a release is made.