Apply #pragma once, misc cleanup (#12322)

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

Marlin/src/HAL/HAL_TEENSY35_36/endstop_interrupts.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * Endstop Interrupts
@@ -34,9 +35,6 @@
  * (Located in Marlin/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino)
  */
 
-#ifndef _ENDSTOP_INTERRUPTS_H_
-#define _ENDSTOP_INTERRUPTS_H_
-
 #include "../../module/endstops.h"
 
 // One ISR for all EXT-Interrupts
@@ -81,5 +79,3 @@ void setup_endstop_interrupts( void ) {
     attachInterrupt(digitalPinToInterrupt(Z_MIN_PROBE_PIN), endstop_ISR, CHANGE);
   #endif
 }
-
-#endif //_ENDSTOP_INTERRUPTS_H_