docs: Fix example of displaying taxonomies
docs: Fix example of displaying taxonomies

Fixes #2216

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