minor corrections in AMo::Model docs [ci skip]

activemodel/README.rdoc

@@ -28,8 +28,8 @@ to integrate with Action Pack out of the box: +ActiveModel::Model+.
     person.age # => 18
     person.valid? # => false
 
-It includes model name instrospection, conversions, translations and
-validations, resulting in a class suitable to be used with ActionPack.
+It includes model name introspections, conversions, translations and
+validations, resulting in a class suitable to be used with Action Pack.
 See +ActiveModel::Model+ for more examples.
 
 Active Model also provides the following functionality to have ORM-like

activemodel/lib/active_model/model.rb

@@ -3,8 +3,8 @@ module ActiveModel
   # == Active Model Basic Model
   #
   # Includes the required interface for an object to interact with +ActionPack+,
-  # using different +ActiveModel+ modules. It includes model name instrospection,
-  # conversions, translations and validations . Besides that, it allows you to
+  # using different +ActiveModel+ modules. It includes model name introspections,
+  # conversions, translations and validations. Besides that, it allows you to
   # initialize the object with a hash of attributes, pretty much like
   # +ActiveRecord+ does.
   #
@@ -51,7 +51,7 @@ module ActiveModel
   #   person = Person.new(:id => 1, :name => 'bob')
   #   person.omg # => true
   #
-  # For more detailed information on other functionality available, please refer
+  # For more detailed information on other functionalities available, please refer
   # to the specific modules included in +ActiveModel::Model+ (see below).
   module Model
     def self.included(base)