Fix example in taxonomies documentation

[DonKult]

The metadata tagname was changed as it conflicts with Series, but the documentation wasn't updated. Also fix the wrapping of the associated comment.

References: 1f93fa77eced42a42c703000ae826d75d68f2815

(composed via editing file directly in github… which seems handy & fast, but also feels super-strange and kinda dirty to be honest)

[spanezz]

:) I think it's ok to take the convenient way