[ci skip] Simply formatting documents

guides/source/active_support_core_extensions.md

@@ -2036,7 +2036,7 @@ Addition only assumes the elements respond to `+`:
 ```ruby
 [[1, 2], [2, 3], [3, 4]].sum    # => [1, 2, 2, 3, 3, 4]
 %w(foo bar baz).sum             # => "foobarbaz"
-{a: 1, b: 2, c: 3}.sum # => [:b, 2, :c, 3, :a, 1]
+{a: 1, b: 2, c: 3}.sum          # => [:b, 2, :c, 3, :a, 1]
 ```
 
 The sum of an empty collection is zero by default, but this is customizable:

guides/source/association_basics.md

@@ -387,7 +387,7 @@ The corresponding migration might look like this:
 class CreateSuppliers < ActiveRecord::Migration[5.0]
   def change
     create_table :suppliers do |t|
-      t.string  :name
+      t.string :name
       t.timestamps
     end
 
@@ -550,8 +550,8 @@ But what if you want to reload the cache, because data might have been changed b
 ```ruby
 author.books                 # retrieves books from the database
 author.books.size            # uses the cached copy of books
-author.books.reload.empty?    # discards the cached copy of books
-                                # and goes back to the database
+author.books.reload.empty?   # discards the cached copy of books
+                             # and goes back to the database
 ```
 
 ### Avoiding Name Collisions
@@ -1841,7 +1841,7 @@ article   = Article.create(name: 'a1')
 person.articles << article
 person.articles << article
 person.articles.inspect # => [#<Article id: 5, name: "a1">, #<Article id: 5, name: "a1">]
-Reading.all.inspect  # => [#<Reading id: 12, person_id: 5, article_id: 5>, #<Reading id: 13, person_id: 5, article_id: 5>]
+Reading.all.inspect     # => [#<Reading id: 12, person_id: 5, article_id: 5>, #<Reading id: 13, person_id: 5, article_id: 5>]
 ```
 
 In the above case there are two readings and `person.articles` brings out both of
@@ -1860,7 +1860,7 @@ article   = Article.create(name: 'a1')
 person.articles << article
 person.articles << article
 person.articles.inspect # => [#<Article id: 7, name: "a1">]
-Reading.all.inspect  # => [#<Reading id: 16, person_id: 7, article_id: 7>, #<Reading id: 17, person_id: 7, article_id: 7>]
+Reading.all.inspect     # => [#<Reading id: 16, person_id: 7, article_id: 7>, #<Reading id: 17, person_id: 7, article_id: 7>]
 ```
 
 In the above case there are still two readings. However `person.articles` shows

guides/source/configuring.md

@@ -131,7 +131,7 @@ defaults to `:debug` for all environments. The available log levels are: `:debug
 
     mylogger           = MyLogger.new(STDOUT)
     mylogger.formatter = config.log_formatter
-    config.logger = ActiveSupport::TaggedLogging.new(mylogger)
+    config.logger      = ActiveSupport::TaggedLogging.new(mylogger)
     ```
 
 * `config.middleware` allows you to configure the application's middleware. This is covered in depth in the [Configuring Middleware](#configuring-middleware) section below.

guides/source/initialization.md

@@ -663,7 +663,7 @@ DEFAULT_OPTIONS = {
 }
 
 def self.run(app, options = {})
-  options  = DEFAULT_OPTIONS.merge(options)
+  options = DEFAULT_OPTIONS.merge(options)
 
   if options[:Verbose]
     app = Rack::CommonLogger.new(app, STDOUT)