Documentation for scatter has link to gist example in Scalala

[shonfeder]

The gist linked as an example of usage of the scatter function goes to code that uses scalala rather than breeze:

breeze/viz/src/main/scala/breeze/plot/package.scala

Line 111 in 50dec75

* Example usage: https://gist.github.com/1288473

For ease of reference, here's the live link currently in the code: https://gist.github.com/1288473