message: Update the mention of `install_test` to reflect the current status.
diff: @@ -280,11 +280,7 @@ user, e.g. when installing Ginkgo system-wide, it might be necessary to prefix
  the call with `sudo`.
  After the installation, CMake can find ginkgo with `find_package(Ginkgo)`.
  -An example can be found in the [`install_test`](install_test/CMakeLists.txt).
  -
  -
  -__Note:__ If the installed ginkgo was built statically and with CUDA,
  -`CUDA` needs to be specified as a language in order for CMake to work properly.
  +An example can be found in the [`test_install`](test_install/CMakeLists.txt).
  ### Licensing
  