Issue #1347914 by batigolix, NROTC_Webmaster, sven.lauer: Clean up API docs for filter module

core/modules/filter/filter.admin-rtl.css

core/modules/filter/filter.admin.css

core/modules/filter/filter.admin.inc

core/modules/filter/filter.admin.js

core/modules/filter/filter.api.php

core/modules/filter/filter.install

core/modules/filter/filter.js

core/modules/filter/filter.module

core/modules/filter/filter.pages.inc

...odules/filter/lib/Drupal/filter/Tests/FilterAdminTest.php

...modules/filter/lib/Drupal/filter/Tests/FilterCrudTest.php

...ilter/lib/Drupal/filter/Tests/FilterDefaultFormatTest.php

...filter/lib/Drupal/filter/Tests/FilterFormatAccessTest.php

...odules/filter/lib/Drupal/filter/Tests/FilterHooksTest.php

...les/filter/lib/Drupal/filter/Tests/FilterNoFormatTest.php

...les/filter/lib/Drupal/filter/Tests/FilterSecurityTest.php

...modules/filter/lib/Drupal/filter/Tests/FilterUnitTest.php