Fix warning in generate example of Getting Started

Fixes #1475

Author: Dave Marr

features/GettingStarted.md

@@ -21,7 +21,7 @@ Install Rails-3
 
 ### Generate a scaffold
 
-    $ rails generate scaffold Widgets name:string
+    $ rails generate scaffold Widget name:string
 
 This generates files in the `app` and `spec` directories. The files in the
 `app` directory are generated by Rails, and Rails delegates the generation of