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Pull request #739: feature/ZBXNEXT-8165-6.4-D (Decimal places in "Top hosts" widget).

Merge in WEB/documentation from feature/ZBXNEXT-8165-6.4-D to release/6.4

* commit 'e22874e0e93a13a9745621540ef60684a2f59597':
  [ZBXNEXT-8165] Decimal places in "Top hosts" widget (updated API "Appendix 2.")
  Added line break in table
  [ZBXNEXT-8165] Decimal places in "Top hosts" widget (updated multiple pages)