Fixed a few typos in the docs. Also changed instances of 'github' -> 'GitHub'.  Not that I care which capitalization is used; just consistency.
Fixed a few typos in the docs. Also changed instances of 'github' -> 'GitHub'.  Not that I care which capitalization is used; just consistency.

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