Documentation/gpu: Update documentation on drm-shared-*

Clarify the documentation in preparation for updated
helpers which check the handle count as well as whether
a dma-buf has been attached.

Link: https://lore.kernel.org/all/20231207180225.439482-1-alexander.deucher@amd.com/Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.keonig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>

Documentation/gpu/drm-usage-stats.rst

@@ -138,7 +138,7 @@ indicating kibi- or mebi-bytes.
 
 - drm-shared-<region>: <uint> [KiB|MiB]
 
-The total size of buffers that are shared with another file (ie. have more
+The total size of buffers that are shared with another file (e.g., have more
 than a single handle).
 
 - drm-total-<region>: <uint> [KiB|MiB]