documentation

[ZBX-21569] Updated "Trigger overview" widget param description.

Merge in WEB/documentation from feature/ZBX-21569-6.4-D to release/6.4

* commit '68a8f69d31c23028eeb5e3fd882716e09312ea06':
  [ZBX-21569] Updated "Trigger overview" widget "Overview" section
  [ZBX-21569] Updated "Trigger overview" widget param description
  [ZBX-21569] Updated "Trigger overview" widget param description
  [ZBX-21569] Updated table formatting
  [ZBX-21569] Updated "Trigger overview" widget param description