I'm not clear which topic this bug pertains to, so I grepped my topics and replace all "plugin" and "Plugin" with "plug-in" and "Plug-in" (including comments).

Changed the following topics:
1841,4606,4887 (this included the topic Title),4888

Searched the rest of the topics and made replacements in:
5127,5278,5391,5721,5828

I misread the title of this bug. 

I checked the word usage guidelines here: https://home.corp.redhat.com/wiki/wordusage#p

It says plug-in is valid. Do not use "plugin".

Did I do the right thing or did I do the opposite? :-)

My bad. This wasn't my bug. :D
But it still begs the question: should it be plug-in in the docs as well?

Matt,

Misty said to put this on hold while she investigates the use of "plugin".

thanks,
Sande

Per email from Misty: 

I had a question about the use of "plug-in" vs "plugin", and Brian did some research to support continued use of "plug-in." This pains me, but I'll dutifully pass it along and play by the rules. :)

"plug-in" has been added to the dictionary.