documentation

Pull request #2448: Feature/DEV-4035 7.3 D

Merge in WEB/documentation from feature/DEV-4035-7.3-D to release/7.4

* commit 'dc417ac9d102381e5215a6b005468618171672f0':
  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).