documentation

Pull request #78: Feature/DEV-2096 6.2 D

Merge in WEB/documentation from feature/DEV-2096-6.2-D to release/6.2

* commit '683c79a9c6484e51d29b6ded1555be6177b0042a':
  DEV-2096 wording change
  DEV-2096 calculation time of triggers with trend functions only
  minor wording change
  DEV-2096 trend function descriptions fixed/improved
  find is a history function
  DEV-2096 separate page for trend functions
  trend function page updated
  wording improvements for trendstl
  wording fix
  removing trend functions; moved to separate page
  trend page updated
  Numbering change
  Numbering change
  Numbering change
  Numbering change
  trend function page
  DEV-2096 trend function page
  [DEV-2096] adding a trend function page