[ostf] Broken link in description of the 'Check that user can deploy WordPress app in Murano environment' test

[Serg Lystopad]

Detailed bug description:
Link to the documentation in test description is broken
http://postimg.org/image/cjs1itr9n/
http://postimg.org/image/tvse49kqz/

Steps to reproduce:
Create and deply Fuel environment with Murano component enabled
Run 'Check that user can deploy WordPress app in Murano environment' test

Expected results:
Correct link to the MOS 8 documentation

Actual result:
Link in the test description point to non existent page

Reproducibility:
reproducible

Impact:
user experience

Description of the environment:
MU1 has been applied
VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "8.0"
  api: "1.0"
  build_number: "570"
  build_id: "570"
  fuel-nailgun_sha: "558ca91a854cf29e395940c232911ffb851899c1"
  python-fuelclient_sha: "4f234669cfe88a9406f4e438b1e1f74f1ef484a5"
  fuel-agent_sha: "658be72c4b42d3e1436b86ac4567ab914bfb451b"
  fuel-nailgun-agent_sha: "b2bb466fd5bd92da614cdbd819d6999c510ebfb1"
  astute_sha: "b81577a5b7857c4be8748492bae1dec2fa89b446"
  fuel-library_sha: "c2a335b5b725f1b994f78d4c78723d29fa44685a"
  fuel-ostf_sha: "3bc76a63a9e7d195ff34eadc29552f4235fa6c52"
  fuel-mirror_sha: "fb45b80d7bee5899d931f926e5c9512e2b442749"
  fuelmenu_sha: "78ffc73065a9674b707c081d128cb7eea611474f"
  shotgun_sha: "63645dea384a37dde5c01d4f8905566978e5d906"
  network-checker_sha: "a43cf96cd9532f10794dce736350bf5bed350e9d"
  fuel-upgrade_sha: "616a7490ec7199f69759e97e42f9b97dfc87e85b"
  fuelmain_sha: "d605bcbabf315382d56d0ce8143458be67c53434"

[Vitaly Sedelnik (vsedelnik)]

Removed from 8.0-mu-2 scope as there is no fix on review. Also downgraded to Medium as cluster functionality is not affected.