Removed extra whitespace

activemodel/lib/active_model/naming.rb

@@ -68,7 +68,7 @@ def _singularize(string, replacement='_')
   #   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 provided
+  # is required to pass the Active Model Lint test. So either extending the provided
   # method below, or rolling your own is required.
   module Naming
     # Returns an ActiveModel::Name object for module. It can be