Update Doxygen comments for some headers (#20194)

drivers/lcd/hd44780.h

···
 #include <stdbool.h>
 
 /**
- * \defgroup hd44780
+ * \file
  *
- * HD44780 Character LCD Driver
+ * \defgroup hd44780 HD44780 Character LCD Driver
  * \{
  */
 

quantum/digitizer.h

···
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-#pragma once
 
-#include "quantum.h"
+#pragma once
 
 #include <stdbool.h>
-#include <stdint.h>
 
 /**
- * \defgroup digitizer
+ * \file
  *
- * HID Digitizer
+ * defgroup digitizer HID Digitizer
  * \{
  */
 

quantum/joystick.h

···
 #include "gpio.h"
 
 /**
- * \defgroup joystick
+ * \file
  *
- * HID Joystick
+ * \defgroup joystick HID Joystick
  * \{
  */
 

quantum/leader.h

···
 #include <stdint.h>
 
 /**
- * \defgroup leader
+ * \file
  *
- * Leader Key
+ * \defgroup leader Leader Key
  * \{
  */
 

quantum/programmable_button.h

···
 #include <stdbool.h>
 
 /**
- * \defgroup programmable_button
+ * \file
  *
- * HID Programmable Buttons
+ * \defgroup programmable_button HID Programmable Buttons
  * \{
  */
 

quantum/secure.h

···
 
 #pragma once
 
-/** \file
+/**
+ * \file
+ *
+ * \defgroup secure Secure API
+ *
+ * \brief Exposes a set of functionality to act as a virtual padlock for your device
+ * ...as long as that padlock is made of paper and it's currently raining.
  *
- * Exposes a set of functionality to act as a virtual padlock for your device
- * ... As long as that padlock is made of paper and its currently raining.
+ * \{
  */
 
 #include <stdint.h>
···
 /** \brief keyboard hook called when changing secure status device
  */
 bool secure_hook_kb(secure_status_t secure_status);
+
+/** \} */

quantum/send_string/send_string.h

···
  */
 
 /**
- * \defgroup send_string
+ * \file
  *
- * Send String API. These functions allow you to create macros by typing out sequences of keystrokes.
+ * \defgroup send_string Send String API
+ *
+ * \brief These functions allow you to create macros by typing out sequences of keystrokes.
  * \{
  */