Apply #pragma once, misc cleanup (#12322)

* Apply #pragma once in headers
* Adjust some thermistors formatting
* Misc cleanup and formatting

Marlin/src/HAL/shared/servo_private.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * servo_private.h - Interrupt driven Servo library for Arduino using 16 bit timers- Version 2
@@ -39,9 +40,6 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#ifndef SERVO_PRIVATE_H
-#define SERVO_PRIVATE_H
-
 #include <stdint.h>
 
 // Architecture specific include
@@ -98,5 +96,3 @@ extern ServoInfo_t servo_info[MAX_SERVOS];
 
 extern void initISR(timer16_Sequence_t timer);
 extern void finISR(timer16_Sequence_t timer);
-
-#endif // SERVO_PRIVATE_H