documentation

Pull request #2402: ZBX-25272 added relevant information for web.certificate.get.

Merge in WEB/documentation from feature/ZBX-25272-7.3-D to release/7.4

* commit 'dc1697f3702ea9fd2134643f4e7d011644f46f49':
  ZBX-25272 replaced the sentence with the recommended one.
  ZBX-25272 formatting for json block.
  ZBX-25272 added relevant information for web.certificate.get.