Update testing documentation to reflect new plugins [docs only]
Update testing documentation to reflect new plugins [docs only]

mhvk/astropy,aleksandr-bakanov/astropy,pllim/astropy,funbaker/astropy,MSeifert04/astropy,DougBurke/astropy,DougBurke/astropy,MSeifert04/astropy,pllim/astropy,MSeifert04/astropy,StuartLittlefair/astropy,mhvk/astropy,saimn/astropy,stargaser/astropy,bsipocz/astropy,pllim/astropy,astropy/astropy,funbaker/astropy,dhomeier/astropy,lpsinger/astropy,mhvk/astropy,pllim/astropy,pllim/astropy,funbaker/astropy,StuartLittlefair/astropy,dhomeier/astropy,dhomeier/astropy,saimn/astropy,funbaker/astropy,larrybradley/astropy,saimn/astropy,mhvk/astropy,mhvk/astropy,aleksandr-bakanov/astropy,DougBurke/astropy,astropy/astropy,DougBurke/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,larrybradley/astropy,bsipocz/astropy,larrybradley/astropy,bsipocz/astropy,stargaser/astropy,astropy/astropy,dhomeier/astropy,larrybradley/astropy,bsipocz/astropy,saimn/astropy,dhomeier/astropy,astropy/astropy,saimn/astropy,astropy/astropy,stargaser/astropy,lpsinger/astropy,lpsinger/astropy,MSeifert04/astropy,lpsinger/astropy,larrybradley/astropy,StuartLittlefair/astropy,lpsinger/astropy,stargaser/astropy