Fix a typo in `time_field` [ci skip]

actionview/lib/action_view/helpers/form_helper.rb

@@ -1066,7 +1066,7 @@ def date_field(object_name, method, options = {})
       # Returns a text_field of type "time".
       #
       # The default value is generated by trying to call +strftime+ with "%T.%L"
-      # on the objects's value. It is still possible to override that
+      # on the object's value. It is still possible to override that
       # by passing the "value" option.
       #
       # === Options