include: drivers: misc: ft8xx: add doxygen to ft8xx_touch_transform

Add missing documentation for ft8xx_touch_transform fields.

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

include/zephyr/drivers/misc/ft8xx/ft8xx.h

@@ -33,12 +33,12 @@ extern "C" {
  * The content of this structure is filled by ft8xx_calibrate().
  */
 struct ft8xx_touch_transform {
-	uint32_t a;
-	uint32_t b;
-	uint32_t c;
-	uint32_t d;
-	uint32_t e;
-	uint32_t f;
+	uint32_t a; /*< Coefficient A of the bitmap transform matrix */
+	uint32_t b; /*< Coefficient B of the bitmap transform matrix */
+	uint32_t c; /*< Coefficient C of the bitmap transform matrix */
+	uint32_t d; /*< Coefficient D of the bitmap transform matrix */
+	uint32_t e; /*< Coefficient E of the bitmap transform matrix */
+	uint32_t f; /*< Coefficient F of the bitmap transform matrix */
 };
 
 /**