For example, you might want to specify that you can find a web-based
view of your documentation in the Glean dictionary, using something like
this:
glean_parser translate -f markdown --output out --option introduction_extra="For another view of these metrics, see the [Glean Dictionary](https://dictionary.protosaur.dev/apps/mozregression)"

The idea is to give people skimming the markdown documentation a pointer to the Glean Dictionary, which
is usually a better way of accessing this information.
This depends on a pending change to the glean parser: mozilla/glean_parser#298