Update experimental-backend.md

Author: lrytz

experimental-backend.md

@@ -54,7 +54,7 @@ In an SBT project, this can be achieved using the following settins:
 
 An sbt project with these options can be found here: https://github.com/lrytz/experimental-backend-2.11/tree/master
 
-[The Gist by @retronym](https://gist.github.com/retronym/0178c212e4bacffed568) explains all the glorious details of creating Java 8 style lambdas in Scala.
+[The Gist by @retronym](https://gist.github.com/retronym/0178c212e4bacffed568) explains all the glorious details required to generate Java 8 style lambdas from Scala code.
 
 ## New Optimizer