Render labels
For example ~bug
should turn into ~bug in process documentation.
See https://docs.gitlab.com/ee/development/gitaly.html for an example:
Include the labels ~Gitaly ~performance technical debt.
From https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20958#note_92146368:
We could add a custom HTMLPipeline that would read .com's API and show the labels, but that would entail some engineering work https://gitlab.com/gitlab-com/gitlab-docs/issues/137.