Adding documentation for undocumented events

[undeadf0x]

No description provided.

[KonSola5]

OK, though the documentation is quite lackluster.

• getEntity and getBlock are not the only methods available on this event. There are a few more methods, like getServer, getRegistries, getLevel and getEntity (the latter of this is basically equivalent to getPlayer most of the time)
• Per https://kubejs.com/wiki/contributing, you should use beans in examples. So instead of:

event.getEntity().getName().getString()

use:

event.entity.displayName.string