drm/vkms: Fix run-tests.sh script name

The script is "run-tests.sh", no "run-test.sh".

Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
Link: https://lore.kernel.org/r/20251024110014.4614-1-jose.exposito89@gmail.com
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>

Author: JoseExposito

Documentation/gpu/vkms.rst

@@ -161,7 +161,7 @@ To return to graphical mode, do::
 
 Once you are in text only mode, you can run tests using the --device switch
 or IGT_DEVICE variable to specify the device filter for the driver we want
-to test. IGT_DEVICE can also be used with the run-test.sh script to run the
+to test. IGT_DEVICE can also be used with the run-tests.sh script to run the
 tests for a specific driver::
 
   sudo ./build/tests/<name of test> --device "sys:/sys/devices/platform/vkms"