docs: Grammar fixes in overview/quickstart.md
docs: Grammar fixes in overview/quickstart.md

bogem/hugo,fedelibre/hugo,gohugoio/hugo,ffrizzo/hugo,anthonyfok/hugo,tischda/hugo,anthonyfok/hugo,ffrizzo/hugo,mitchchn/hugo,vbatoufflet/hugo,mdhender/hugo,jygastaud/hugo,mdhender/hugo,digitalcraftsman/hugo,tubo028/hugo,mdhender/hugo,Zenithar/hugo,tischda/hugo,bogem/hugo,fedelibre/hugo,mayah/hugo,MarkDBlackwell/hugo,digitalcraftsman/hugo,fedelibre/hugo,jygastaud/hugo,Zenithar/hugo,vbatoufflet/hugo,melo/hugo,abourget/hugo,fedelibre/hugo,abourget/hugo,MarkDBlackwell/hugo,melo/hugo,mitchchn/hugo,tubo028/hugo,mayah/hugo,anthonyfok/hugo,gohugoio/hugo,gohugoio/hugo,mdhender/hugo