Reference documentation for Blockly.Events.* methods and constants is mostly useless #8586
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Description
The documentation for many of the constants and methods on Blockly.Events is more or less useless, describing all of these as variables (rather than constants / methods) and providing only uninformative type information). For example, Blockly.Events.setGroup is useless described as](https://developers.google.com/blockly/reference/js/blockly.events_namespace.setgroup_variable.md):
Events.setGroup variable
Signature:
setGroup: typeof eventUtils.setGroup
This is probably due to some interaction between how we reexport these methods and how API Extractor works and likely affects much of the rest of our documentation as well.
N.B.: How these methods are exported was changed in #8530 (to use export … from …), which might or might not be relevant.