markdown: link's href component not found (BB-9062)

When using the link parameters below, markdown rendering doesn't seem to find the href component. The result is that the link links to the current page instead of the intended target.

• Reproducible: always
• Sample link parameters:

• • link text: K&R, Stroustrup variant
  • link url: https://en.wikipedia.org/wiki/Indent_style#Variant:_Stroustrup

Rendered example:
K&R, Stroustrup variant