tutorial on MT has link broken

[brando90]

check:

“Teacher forcing” is the concept of using the real target outputs as each next input, instead of using the decoder’s guess as the next input. Using teacher forcing causes it to converge faster but when the trained network is exploited, it may exhibit instability.

http://minds.jacobs-university.de/sites/default/files/uploads/papers/ESNTutorialRev.pdf

[jspisak]

I put a PR together to update this: #589

If nothing else, I am going to close this.