tests: add more test descriptions

Add more test descriptions based on exiting comments.

Signed-off-by: Thomas Wood <thomas.wood@intel.com>

tests/gem_tiled_pread_pwrite.c

@@ -36,7 +36,7 @@
  */
 
 /*
- * Testcase: Test swizzling by testing pwrite does the invers of pread
+ * Testcase: Test swizzling by testing pwrite does the inverse of pread
  *
  * Together with the explicit pread testcase, this should cover our swizzle
  * handling.
@@ -61,6 +61,9 @@
 #include "intel_io.h"
 #include "igt_aux.h"
 
+IGT_TEST_DESCRIPTION("Test swizzling by testing pwrite does the inverse of"
+		     " pread.");
+
 #define WIDTH 512
 #define HEIGHT 512
 static uint32_t linear[WIDTH * HEIGHT];