documentation

Pull request #4357: Feature/DEV-4328 7.5 D s13

Merge in WEB/documentation from feature/DEV-4328-7.5-D-s13 to release/8.0

* commit '0b58bbbc7a8828a4580d37466fa5636183f8a03d':
  [DEV-4328] updated wording (sub-issue 13)
  [DEV-4328] updated description (sub-issue 13)
  [DEV-4328] updated wording (sub-issue 13)
  [DEV-4328] updated instructions on Creating your own theme page (sub-issue 13)