Update initializer.rb.erb

Fix typo in initializer

Author: Ben Marx

lib/generators/apipie/install/templates/initializer.rb.erb

@@ -2,6 +2,6 @@ Apipie.configure do |config|
   config.app_name                = "<%= Rails.application.class.name[/^\w+/] %>"
   config.api_base_url            = "<%= options.api_path %>"
   config.doc_base_url            = "<%= options.route %>"
-  # were is your API defined?
+  # where is your API defined?
   config.api_controllers_matcher = "#{Rails.root}/app/controllers/*.rb"
 end