fix docstrings in test for convolving gaussians [skip ci]
fix docstrings in test for convolving gaussians [skip ci]

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