documentation

Pull request #2384: feature/DEV-4169-7.3-D. Clarified case-sensitive login behavior.

Merge in WEB/documentation from feature/DEV-4169-7.3-D to release/7.4

* commit '743c2c85ebf1cb9b06b6e430a084e9b88912e718':
  [DEV-4169] clarified case-sensitive login behavior