Use Active Model, not ActiveModel in plain English

Also prevents the word "Model" from linking to the documentation
of ActiveModel::Model because that's not intended.

[ci skip]

activemodel/lib/active_model/conversion.rb

@@ -22,7 +22,7 @@ module ActiveModel
   module Conversion
     extend ActiveSupport::Concern
 
-    # If your object is already designed to implement all of the Active Model
+    # If your object is already designed to implement all of the \Active \Model
     # you can use the default <tt>:to_model</tt> implementation, which simply
     # returns +self+.
     #
@@ -33,9 +33,9 @@ module ActiveModel
     #   person = Person.new
     #   person.to_model == person # => true
     #
-    # If your model does not act like an Active Model object, then you should
+    # If your model does not act like an \Active \Model object, then you should
     # define <tt>:to_model</tt> yourself returning a proxy object that wraps
-    # your object with Active Model compliant methods.
+    # your object with \Active \Model compliant methods.
     def to_model
       self
     end

activemodel/lib/active_model/dirty.rb

@@ -102,7 +102,7 @@ module ActiveModel
   #
   # If an attribute is modified in-place then make use of
   # +[attribute_name]_will_change!+ to mark that the attribute is changing.
-  # Otherwise Active Model can't track changes to in-place attributes. Note
+  # Otherwise \Active \Model can't track changes to in-place attributes. Note
   # that Active Record can detect in-place modifications automatically. You do
   # not need to call +[attribute_name]_will_change!+ on Active Record models.
   #

activemodel/lib/active_model/gem_version.rb

@@ -1,5 +1,5 @@
 module ActiveModel
-  # Returns the version of the currently loaded Active Model as a <tt>Gem::Version</tt>
+  # Returns the version of the currently loaded \Active \Model as a <tt>Gem::Version</tt>
   def self.gem_version
     Gem::Version.new VERSION::STRING
   end

activemodel/lib/active_model/naming.rb

@@ -211,7 +211,7 @@ module ActiveModel
   #   BookModule::BookCover.model_name.i18n_key  # => :"book_module/book_cover"
   #
   # Providing the functionality that ActiveModel::Naming provides in your object
-  # is required to pass the Active Model Lint test. So either extending the
+  # is required to pass the \Active \Model Lint test. So either extending the
   # provided method below, or rolling your own is required.
   module Naming
     def self.extended(base) #:nodoc:

activemodel/lib/active_model/serializers/xml.rb

@@ -6,7 +6,7 @@ require 'active_support/core_ext/time/acts_like'
 
 module ActiveModel
   module Serializers
-    # == Active Model XML Serializer
+    # == \Active \Model XML Serializer
     module Xml
       extend ActiveSupport::Concern
       include ActiveModel::Serialization

activemodel/lib/active_model/validations/absence.rb

@@ -1,6 +1,6 @@
 module ActiveModel
   module Validations
-    # == Active Model Absence Validator
+    # == \Active \Model Absence Validator
     class AbsenceValidator < EachValidator #:nodoc:
       def validate_each(record, attr_name, value)
         record.errors.add(attr_name, :present, options) if value.present?

activemodel/lib/active_model/validator.rb

@@ -127,7 +127,7 @@ module ActiveModel
   # in the options hash invoking the <tt>validate_each</tt> method passing in the
   # record, attribute and value.
   #
-  # All Active Model validations are built on top of this validator.
+  # All \Active \Model validations are built on top of this validator.
   class EachValidator < Validator #:nodoc:
     attr_reader :attributes
 

activemodel/lib/active_model/version.rb

@@ -1,7 +1,7 @@
 require_relative 'gem_version'
 
 module ActiveModel
-  # Returns the version of the currently loaded ActiveModel as a <tt>Gem::Version</tt>
+  # Returns the version of the currently loaded \Active \Model as a <tt>Gem::Version</tt>
   def self.version
     gem_version
   end