Use 1.9 hash style in changelog and doc examples [ci skip]

activerecord/CHANGELOG.md

@@ -3,12 +3,12 @@
 *   Added functionality to unscope relations in a relations chain. For
     instance, if you are passed in a chain of relations as follows:
 
-        Posts.select(:name => "John").order('id DESC') 
+        Posts.select(name: "John").order('id DESC')
 
     but you want to get rid of order, then this feature allows you to do:
 
-        Posts.select(:name => "John").order("id DESC").unscope(:order)
-            == Posts.select(:name => "John")
+        Posts.select(name: "John").order("id DESC").unscope(:order)
+            == Posts.select(name: "John")
 
     The .unscope() function is more general than the .except() method because
     .except() only works on the relation it is acting on. However, .unscope()

activerecord/lib/active_record/relation/query_methods.rb

@@ -331,15 +331,15 @@ def reorder!(*args) # :nodoc:
     # which should be unscoped. The valid arguments are given in VALID_UNSCOPING_VALUES.
     # The method can also be called with multiple arguments. For example:
     #
-    #   User.all.order('email DESC').select('id').where(:name => "John")
+    #   User.all.order('email DESC').select('id').where(name: "John")
     #       .unscope(:order, :select, :where) == User.all
     #
     # One can additionally pass a hash as an argument to unscope specific :where values.
     # This is done by passing a hash with a single key-value pair. The key should be
     # :where and the value should be the where value to unscope. For example:
     #
-    #   User.all.where(:name => "John", :active => true).unscope(:where => :name)
-    #       == User.all.where(:active => true)
+    #   User.all.where(name: "John", active: true).unscope(where: :name)
+    #       == User.all.where(active: true)
     #
     # Note that this method is more generalized than ActiveRecord::SpawnMethods#except
     # because #except will only affect a particular relation's values. It won't wipe