Issue #3230418 by TR: [D7] Coding standards - return type documentation

entity.api.php

entity.info.inc

entity.module

entity_token.tokens.inc

includes/entity.controller.inc

includes/entity.inc

includes/entity.property.inc

includes/entity.ui.inc

includes/entity.wrapper.inc

modules/callbacks.inc

tests/entity_test.module

views/entity.views.inc

views/entity_views_example_query.php

views/handlers/entity_views_field_handler_helper.inc