gplugin/gplugin

Better document the example plugins and cover the shutdown parameter to unload

20 months ago, Gary Kramlich
2bf12275c35d
Better document the example plugins and cover the shutdown parameter to unload

Testing Done:
Ran `codespell`

Reviewed at https://reviews.imfreedom.org/r/1694/
EionRobb <> EionRobb <eion@robbmob.com>
ivanhoe <107501-ivanhoe@users.noreply.gitlab.com> ivanhoe <ivanhoe@fiscari.de>
Richard Laager <rlaager@pidgin.im> <rlaager@wiktel.com>