Remove markup from user documentation
Remove markup from user documentation

Remove markup that ends up making it through onto the web. These
two symbols do not have an obvious place to link to, so they are
left as ``name`` rather than a :meth: link.

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