Documentation: the decorators section doesn't list/explain them

[Quarkx-lab]

The following page:
https://www.boost.org/doc/libs/latest/libs/test/doc/html/boost_test/tests_organization/decorators.html
says:
"Decorator" is a uniform mechanism for updating various attributes of the automatically registered test units. These attributes affect how the test tree is processed during the execution of the test module and include test unit description, floating-point tolerance and the number of expected failures among others. They are listed in detail in the following sections.
But they are not listed/explained.

The expected list is splitted in to locations :
https://www.boost.org/doc/libs/latest/libs/test/doc/html/boost_test/utf_reference/test_org_reference.html
https://www.boost.org/doc/libs/latest/libs/test/doc/html/boost_test/testing_tools/summary.html