doc: Use <ulink> to make Gimbal Lock reactive
doc: Use <ulink> to make Gimbal Lock reactive

Instead of just having the reference at the end of the paragraph.
Usually seen as more usable.

(cherry picked from commit 6988d3ae61ab16fb298b34d2bd31860833f04186)

Distrotech/cogl,Distrotech/cogl,Distrotech/cogl,Distrotech/cogl