Fix ZScaleInterval min_npixels docstring
Fix ZScaleInterval min_npixels docstring

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