Update installation documentation for Fedora [docs only]
Update installation documentation for Fedora [docs only]

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