documentation

Pull request #2539: Feature/ZBX-25027 7.3 D

Merge in WEB/documentation from feature/ZBX-25027-7.3-D to release/7.4

* commit '14c1fd507b74d8181d95ce4a348c91bbd1c650f6':
  ZBX-25027 fixed a comment block.
  ZBX-25027 moved a note to a new section, note position changes to relevant places.
  ZBX-25027 changed the section name in links.
  ZBX-25027 improved section content.
  ZBX-25027 replace proxy section, note improvements.
  ZBX-25027 moved the created proxy maintenance section, added a link to the note leading to it.
  ZBX-25027 added a missing space.
  ZBX-25027 Improved note position, remade note as a section.
  ZBX-25027 added and edited notes about proxy maintenance.
  ZBX-25027 initial changes.