Remove docs too

docs/docsite/rst/dev_guide/testing/sanity/no-tests-as-filters.rst

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-Sanity Tests » no-tests-as-filters
-==================================
-
-Using Ansible provided Jinja2 tests as filters will be removed in Ansible 2.9.
-
-Prior to Ansible 2.5, Jinja2 tests included within Ansible were most often used as filters. The large difference in use is that filters are referenced as ``variable | filter_name`` while Jinja2 tests are referenced as ``variable is test_name``.
-
-Jinja2 tests are used for comparisons, whereas filters are used for data manipulation, and have different applications in Jinja2. This change is to help differentiate the concepts for a better understanding of Jinja2, and where each can be appropriately used.
-
-As of Ansible 2.5 using an Ansible provided Jinja2 test with filter syntax will display a deprecation error.