Update some functions in astropy/io/ascii/core.py to use Numpy docstrings format [#3352]
Update some functions in astropy/io/ascii/core.py to use Numpy docstrings format [#3352]

Minor change to function docstring format

Fix documentation error caused by use of single backticks

lpsinger/astropy,bsipocz/astropy,MSeifert04/astropy,kelle/astropy,mhvk/astropy,DougBurke/astropy,MSeifert04/astropy,tbabej/astropy,aleksandr-bakanov/astropy,pllim/astropy,astropy/astropy,pllim/astropy,saimn/astropy,AustereCuriosity/astropy,funbaker/astropy,larrybradley/astropy,saimn/astropy,pllim/astropy,astropy/astropy,astropy/astropy,funbaker/astropy,dhomeier/astropy,mhvk/astropy,dhomeier/astropy,joergdietrich/astropy,joergdietrich/astropy,pllim/astropy,AustereCuriosity/astropy,StuartLittlefair/astropy,AustereCuriosity/astropy,kelle/astropy,mhvk/astropy,larrybradley/astropy,AustereCuriosity/astropy,aleksandr-bakanov/astropy,saimn/astropy,DougBurke/astropy,kelle/astropy,astropy/astropy,larrybradley/astropy,DougBurke/astropy,larrybradley/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,funbaker/astropy,saimn/astropy,lpsinger/astropy,bsipocz/astropy,kelle/astropy,larrybradley/astropy,StuartLittlefair/astropy,tbabej/astropy,funbaker/astropy,aleksandr-bakanov/astropy,tbabej/astropy,MSeifert04/astropy,AustereCuriosity/astropy,joergdietrich/astropy,dhomeier/astropy,joergdietrich/astropy,stargaser/astropy,pllim/astropy,kelle/astropy,astropy/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,mhvk/astropy,lpsinger/astropy,bsipocz/astropy,DougBurke/astropy,stargaser/astropy,lpsinger/astropy,mhvk/astropy,joergdietrich/astropy,stargaser/astropy,dhomeier/astropy,tbabej/astropy,MSeifert04/astropy,dhomeier/astropy,StuartLittlefair/astropy,bsipocz/astropy,saimn/astropy,tbabej/astropy,stargaser/astropy