documentation

Pull request #2447: Feature/DEV-4035 7.2 D

Merge in WEB/documentation from feature/DEV-4035-7.2-D to release/7.2

* commit '8e6184e7644a9555daaeebe5755903eb331c8e2e':
  DEV-4035 updated screenshots for consistency.
  DEV-4035 fixed a typo.
  DEV-4035 consistency and formatting improvements.
  DEV-4035 added a better screenshot.
  DEV-4035 formatting, sentences paraphrasing and removal, added better screenshot.
  DEV-4035 addressed review comments.
  DEV-4035 guides improvements, style unification.
  DEV-4035 added and corrected a note, changed screenshot (previous had a potential to confuse a reader).
  DEV-4035 clarified information for active/passive checks.
  DEV-4035 added a note regarding port configuration (comment 3).