gplugin/gplugin

Fix plugin row docs

19 months ago, Elliott Sales de Andrade
acb56ed64e56
Fix plugin row docs

Add a missing property doc and `Since` tags.

Testing Done:
Compiled and skimmed through the docs.

Reviewed at https://reviews.imfreedom.org/r/1841/
REVIEWBOARD_URL = "https://reviews.imfreedom.org/"
REPOSITORY = "gplugin/gplugin"
REPOSITORY_TYPE = "mercurial"
BRANCH = "default"
LAND_DEST_BRANCH = "default"
LAND_PUSH = False