This question is in reference to Atlassian Documentation: Mark up comments
On the page itself, this content is in blue and the link is blue:
For a tutorial Bitbucket's Markdown support, including syntax examples, see our Markdown demo repository.
It has taken me nearly a year to realize that the link existed! Instead, my eye is drawn to the big information box which has much more visual weight than the title.
The big info box then links to the pypi page for the markdown package. This is not helpful even a little bit.
Now that I've finally found it, the quality of the Markdown demo repository seems ok, but please Atlassian fix the IA on the Mark up comments page.