The HTMLRenderer plugin will include WebSocketClose in EventList, not MethodList, which is different to the existing HTMLRenderer

[dyaandys]

See Mantis 22309 and Project 00367
https://mantis.dyalog.com/view.php?id=22309
https://wiki.bramley.dyalog.com/index.php/00367_HtmlRenderer_as_a_%E2%8E%95WC_Plugin

This change must be included in the 21.0 Release Notes
This change will affect at least
object-reference/methodorevents/websocketclose/
object-reference/proplists/htmlrenderer/
object-reference/eventlists/htmlrenderer/
object-reference/docs/methodlists/htmlrenderer.md
object-reference/docs/methodorevents/websocketupgrade
object-reference/docs/gui-overview/events-a-z
object-reference/mkdocs.yml
the navigation bar

It may have an impact on Brian's HTMLRenderer document too.
There may be other places where websocketclose is mentioned.