docs: Correct name of release archives for OS X
docs: Correct name of release archives for OS X

Fixes #2341

MarkDBlackwell/hugo,mdhender/hugo,bogem/hugo,gohugoio/hugo,anthonyfok/hugo,fedelibre/hugo,fedelibre/hugo,mayah/hugo,bogem/hugo,jygastaud/hugo,digitalcraftsman/hugo,anthonyfok/hugo,MarkDBlackwell/hugo,tubo028/hugo,fedelibre/hugo,Zenithar/hugo,jygastaud/hugo,mdhender/hugo,digitalcraftsman/hugo,mitchchn/hugo,fedelibre/hugo,mdhender/hugo,mayah/hugo,gohugoio/hugo,Zenithar/hugo,anthonyfok/hugo,mitchchn/hugo,mdhender/hugo,gohugoio/hugo,tubo028/hugo