Backport of "vulkan: don't link to XOpenDisplay in documentation" into 1.18
requested to merge tpm/gst-plugins-bad:backport-mr-2518-into-1.18-remove-xopendisplay-link into 1.18
Backport of !2518 (merged) "vulkan: don't link to XOpenDisplay in documentation".
Commits:
- 846cf3b2 vulkan: don't link to XOpenDisplay in documentation