Add example use of TDIM for fits table (fix #6900)
Add example use of TDIM for fits table (fix #6900)

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