adding docs for 'depth_phased' and 'depth_half'
adding docs for 'depth_phased' and 'depth_half'

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