drivers: console: remove @return doc for void functions

For functions returning nothing, there is no need to document
with @return, as Doxgen complains about "documented empty
return type of ...".

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

drivers/console/uart_console.c

@@ -566,10 +566,7 @@ void uart_register_input(struct k_fifo *avail, struct k_fifo *lines,
 #endif
 
 /**
- *
  * @brief Install printk/stdout hook for UART console output
- *
- * @return N/A
  */
 
 static void uart_console_hook_install(void)
@@ -583,7 +580,6 @@ static void uart_console_hook_install(void)
 }
 
 /**
- *
  * @brief Initialize one UART as the console/debug port
  *
  * @return 0 if successful, otherwise failed.

drivers/console/xtensa_sim_console.c

@@ -51,7 +51,6 @@ extern void __printk_hook_install(int (*fn)(int));
 
 /**
  * @brief Install printk/stdout hook for Xtensa Simulator console output
- * @return N/A
  */
 static void xt_sim_console_hook_install(void)
 {

include/console/console.h

@@ -82,8 +82,6 @@ int console_putchar(char c);
  *  access to console via console_getline() function. This function
  *  supersedes, and incompatible with, callback (push-style) console
  *  handling (via console_input_fn callback, etc.).
- *
- *  @return N/A
  */
 void console_getline_init(void);
 

include/drivers/console/console.h

@@ -38,8 +38,6 @@ struct console_input {
  *  @param lines k_fifo queue of entered lines which to be processed
  *         in the application code.
  *  @param completion callback for tab completion of entered commands
- *
- *  @return N/A
  */
 typedef void (*console_input_fn)(struct k_fifo *avail, struct k_fifo *lines,
 				 uint8_t (*completion)(char *str, uint8_t len));

include/drivers/console/uart_console.h

@@ -26,8 +26,6 @@ extern "C" {
  *  @param lines k_fifo queue of entered lines which to be processed
  *         in the application code.
  *  @param completion callback for tab completion of entered commands
- *
- *  @return N/A
  */
 void uart_register_input(struct k_fifo *avail, struct k_fifo *lines,
 			 uint8_t (*completion)(char *str, uint8_t len));