Improve description of Quantity.to_string subformat
Improve description of Quantity.to_string subformat

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