Multi-line comments cleanup (#19535)

Marlin/src/HAL/AVR/HAL.h

@@ -15,6 +15,7 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
  */
 #pragma once
 

Marlin/src/HAL/AVR/Servo.cpp

@@ -48,7 +48,6 @@
  * readMicroseconds()    - Get the last-written servo pulse width in microseconds.
  * attached()            - Return true if a servo is attached.
  * detach()              - Stop an attached servo from pulsing its i/o pin.
- *
  */
 
 #ifdef __AVR__

Marlin/src/HAL/AVR/timers.h

@@ -15,6 +15,7 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
  */
 #pragma once