add issue links for intel's inability to show total vram usage

Author: 17314642

README.md

@@ -689,6 +689,8 @@ Example output:
 - GPU temperature and vram temperature for `xe` requires **linux 6.15+** 
 - Fan speed for `xe` requires **linux 6.16+**
 - GPU usage and memory usage shows usage of current process, not total system usage (it's an issue on intel's side)
+  - https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14153
+  - https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/4861
 - Integrated Intel GPUs are **limited** due to lack of hwmon interface (it's an issue on intel's side, [i915 source](https://github.com/torvalds/linux/blob/5fc31936081919a8572a3d644f3fbb258038f337/drivers/gpu/drm/i915/i915_hwmon.c#L914-L916), [xe source](https://github.com/torvalds/linux/blob/5fc31936081919a8572a3d644f3fbb258038f337/drivers/gpu/drm/xe/xe_hwmon.c#L824-L826))
 
 #### Panfrost and Panthor notes