documentation

Pull request #1669: feature/ZBXNEXT-8908-7.0-D. Show values in Pie chart legend.

Merge in WEB/documentation from feature/ZBXNEXT-8908-7.0-D to release/7.0

* commit 'c93862da40ba41e94ae7595a3c093377187d53c6':
  [ZBXNEXT-8908] Show values in Pie chart legend