Update Time documentation to better reflect current precision levels
Update Time documentation to better reflect current precision levels

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