Update Doc for ActiveRecord::RecordNotSaved to be consistent

Author: fffx

activerecord/lib/active_record/errors.rb

@@ -129,8 +129,10 @@ def initialize(message = nil, model = nil, primary_key = nil, id = nil)
   end
 
   # Raised by {ActiveRecord::Base#save!}[rdoc-ref:Persistence#save!] and
-  # {ActiveRecord::Base.create!}[rdoc-ref:Persistence::ClassMethods#create!]
-  # methods when a record is invalid and cannot be saved.
+  # {ActiveRecord::Base.update_attribute!}[rdoc-ref:Persistence#update_attribute!]
+  # methods when a record is failed to validate or cannot be saved due to any of the
+  # <tt>before_*</tt> callbacks throwing +:abort+. See
+  # ActiveRecord::Callbacks for further details
   class RecordNotSaved < ActiveRecordError
     attr_reader :record