Fix some comment formatting

Marlin/src/HAL/HAL_STM32/spi_pins.h

@@ -20,7 +20,6 @@
 
 /**
  * Define SPI Pins: SCK, MISO, MOSI, SS
- *
  */
 #ifndef SCK_PIN
   #define SCK_PIN   13

Marlin/src/HAL/HAL_STM32F4/spi_pins.h

@@ -16,14 +16,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-
-#ifndef SPI_PINS_H_
-#define SPI_PINS_H_
-
+#pragma once
 
 /**
  * Define SPI Pins: SCK, MISO, MOSI, SS
- *
  */
 #ifndef SCK_PIN
   #define SCK_PIN   PA5
@@ -37,5 +33,3 @@
 #ifndef SS_PIN
   #define SS_PIN    PA8
 #endif
-
-#endif // SPI_PINS_H_

Marlin/src/HAL/HAL_STM32F7/spi_pins.h

@@ -16,17 +16,12 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-
-#ifndef SPI_PINS_H_
-#define SPI_PINS_H_
+#pragma once
 
 /**
  * Define SPI Pins: SCK, MISO, MOSI, SS
- *
  */
 #define SCK_PIN   PA5
 #define MISO_PIN  PA6
 #define MOSI_PIN  PA7
 #define SS_PIN    PA8
-
-#endif // SPI_PINS_H_