Merge pull request #17110 from claudiob/remove-running-tests

Remove RUNNING UNIT TESTS from ActionPack

actionpack/RUNNING_UNIT_TESTS.rdoc

-== Running with Rake
-
-The easiest way to run the unit tests is through Rake. The default task runs
-the entire test suite for all classes. For more information, check out the
-full array of rake tasks with "rake -T".
-
-Rake can be found at http://docs.seattlerb.org/rake/.
-
-== Running by hand
-
-Run a single test suite:
-
-   rake test TEST=path/to/test.rb
-
-Run one test in a test suite:
-
-   rake test TEST=path/to/test.rb TESTOPTS="--name=test_something"