Update what-and-why.md

Fix typo 😄

Author: mparramont

docs/what-and-why.md

@@ -67,7 +67,7 @@ Here are some alternatives that share similar concepts with Reason:
 
 - [Rust](http://rust-lang.org). Inspired by the ML family of languages, but not garbage collected. Has excellent parallelism support.
 - [Elm](http://elm-lang.org). Another great language in the ML family. Focuses on building web applications. See the widely praised talk on Elm, [Let's Be Mainstream](https://www.youtube.com/watch?v=oYk8CKH7OhE).
-- [PureScript](http://www.purescript.org). Inspired by Haskell, compiles to the JavaScript.
+- [PureScript](http://www.purescript.org). Inspired by Haskell, compiles to JavaScript.
 - [Fable](http://fable.io/). Based on F#, which is closely related to OCaml.
 - [ClojureScript](https://clojurescript.org). Dynamically typed language that prioritizes simplicity & great interop.
 - [Swift](https://www.apple.com/swift/). Language built by Apple, and interoperates with Objective-C well.