documentation

[ZBX-20110] Query separate tablespaces in Oracle databases with Zabbix agent 2.

Merge in WEB/documentation from feature/ZBX-20110-6.4-D to release/6.4

* commit '46f96047ad07ae12c1532273bd4075764e66ce93':
  [ZBX-20110] Updated heading "Updated templates" size
  [ZBX-20110] Updated list formatting in "Template changes"
  [ZBX-20110] Updated "Template changes"
  [ZBX-20110] Removed templates inherited from 6.2; updated "Items" formatting
  whatsnew640.md fixed formatting
  [ZBX-20110] Updated formatting
  [ZBX-20110] Updated "What's new", "Template changes", oralce.ts.stats item
  [ZBX-20110] Updated page "Template changes"
  [ZBX-20110] Updated agent2 key "oracle.ts.stats"
  [ZBX-20110] Updated multiple agent2 Oracle item keys
  [ZBX-20110] Updated agent2 key "oracle.ts.stats"