Clarify when config file is written.
Clarify when config file is written.

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