Fix Bundler setup instructions

When trying to follow the instructions locally, they did not work until
I realized they were out of order. The Rake command needs to be executed
in the root directory before switching to the bundler directory.

bundler/doc/development/SETUP.md

@@ -12,18 +12,15 @@ To work on Bundler, you'll probably want to do a couple of things:
 
         $ brew install graphviz
 
-* Install development dependencies from the rubygems root directory:
+* Install development dependencies and Bundler's test dependencies from the rubygems root directory:
 
         $ rake setup
+        $ bin/rake spec:parallel_deps
 
 * Change into the bundler directory:
 
         $ cd bundler
 
-* Install Bundler's test dependencies:
-
-        $ bin/rake spec:parallel_deps
-
 * Now you can run the test suite in parallel:
 
         $ bin/parallel_rspec