Added more examples and cleaned up the GroupBy functionality documentation
Added more examples and cleaned up the GroupBy functionality documentation

mayah/hugo,mitchchn/hugo,MarkDBlackwell/hugo,badoet/hugo,mdhender/hugo,bramp/hugo,bogem/hugo,gohugoio/hugo,vbatoufflet/hugo,tatsushid/hugo,abourget/hugo,fedelibre/hugo,gohugoio/hugo,ryanclarke/hugo,MarkDBlackwell/hugo,halostatue/hugo,ifraixedes/hugo,sprig/hugo,tatsushid/hugo,tjyang/hugo,mdhender/hugo,melo/hugo,vbatoufflet/hugo,tjyang/hugo,ryanclarke/hugo,coderzh/hugo,mitchchn/hugo,bogem/hugo,tischda/hugo,fhergomez/hugo,badoet/hugo,kujohn/hugo,halostatue/hugo,melo/hugo,digitalcraftsman/hugo,jygastaud/hugo,ifraixedes/hugo,soundrussian/hugo,coderzh/hugo,gohugoio/hugo,soundrussian/hugo,mayah/hugo,Zenithar/hugo,derekperkins/hugo,tubo028/hugo,fedelibre/hugo,anthonyfok/hugo,bramp/hugo,mdhender/hugo,abourget/hugo,fedelibre/hugo,tubo028/hugo,digitalcraftsman/hugo,mdhender/hugo,sprig/hugo,anthonyfok/hugo,Zenithar/hugo,kujohn/hugo,fedelibre/hugo,derekperkins/hugo,tischda/hugo,ffrizzo/hugo,fhergomez/hugo,ffrizzo/hugo,anthonyfok/hugo,jygastaud/hugo