Remove double spaces in code examples

guides/source/2_3_release_notes.md

@@ -173,8 +173,8 @@ before_save :update_credit_rating, :if => :active,
 Rails now has a `:having` option on find (as well as on `has_many` and `has_and_belongs_to_many` associations) for filtering records in grouped finds. As those with heavy SQL backgrounds know, this allows filtering based on grouped results:
 
 ```ruby
-developers =  Developer.find(:all, :group => "salary",
-  :having => "sum(salary) >  10000", :select => "salary")
+developers = Developer.find(:all, :group => "salary",
+  :having => "sum(salary) > 10000", :select => "salary")
 ```
 
 * Lead Contributor: [Emilio Tagua](http://github.com/miloops)

guides/source/active_record_querying.md

@@ -1229,7 +1229,7 @@ One important caveat is that `default_scope` will be overridden by
 
 ```ruby
 class User < ActiveRecord::Base
-  default_scope  { where state: 'pending' }
+  default_scope { where state: 'pending' }
   scope :active, -> { where state: 'active' }
   scope :inactive, -> { where state: 'inactive' }
 end

guides/source/form_helpers.md

@@ -885,7 +885,7 @@ end
         :name => 'John Doe',
         :addresses_attributes => {
             '0' => {
-                :kind  => 'Home',
+                :kind => 'Home',
                 :street => '221b Baker Street',
             },
             '1' => {

guides/source/i18n.md

@@ -174,7 +174,7 @@ end
 # in your /etc/hosts file to try this out locally
 def extract_locale_from_tld
   parsed_locale = request.host.split('.').last
-  I18n.available_locales.include?(parsed_locale.to_sym) ? parsed_locale  : nil
+  I18n.available_locales.include?(parsed_locale.to_sym) ? parsed_locale : nil
 end
 ```
 

guides/source/initialization.md

@@ -36,8 +36,8 @@ This file is as follows:
 
 ```ruby
 #!/usr/bin/env ruby
-APP_PATH = File.expand_path('../../config/application',  __FILE__)
-require File.expand_path('../../config/boot',  __FILE__)
+APP_PATH = File.expand_path('../../config/application', __FILE__)
+require File.expand_path('../../config/boot', __FILE__)
 require 'rails/commands'
 ```
 
@@ -373,7 +373,7 @@ The `options[:config]` value defaults to `config.ru` which contains this:
 ```ruby
 # This file is used by Rack-based servers to start the application.
 
-require ::File.expand_path('../config/environment',  __FILE__)
+require ::File.expand_path('../config/environment', __FILE__)
 run <%= app_const %>
 ```
 
@@ -388,7 +388,7 @@ app = eval "Rack::Builder.new {( " + cfgfile + "\n )}.to_app",
 The `initialize` method of `Rack::Builder` will take the block here and execute it within an instance of `Rack::Builder`. This is where the majority of the initialization process of Rails happens. The `require` line for `config/environment.rb` in `config.ru` is the first to run:
 
 ```ruby
-require ::File.expand_path('../config/environment',  __FILE__)
+require ::File.expand_path('../config/environment', __FILE__)
 ```
 
 ### `config/environment.rb`
@@ -546,7 +546,7 @@ def self.run(app, options={})
   else
     server.register('/', Rack::Handler::Mongrel.new(app))
   end
-  yield server  if block_given?
+  yield server if block_given?
   server.run.join
 end
 ```

guides/source/migrations.md

@@ -877,7 +877,7 @@ end
 # app/models/product.rb
 
 class Product < ActiveRecord::Base
-  validates :flag, inclusion:  { in: [true, false] }
+  validates :flag, inclusion: { in: [true, false] }
   validates :fuzz, presence: true
 end
 ```

guides/source/rails_on_rack.md

@@ -82,7 +82,7 @@ To use `rackup` instead of Rails' `rails server`, you can put the following insi
 
 ```ruby
 # Rails.root/config.ru
-require ::File.expand_path('../config/environment',  __FILE__)
+require ::File.expand_path('../config/environment', __FILE__)
 
 use Rack::Debugger
 use Rack::ContentLength