docs: removed unceccessary comments

kernel/arch/x86_64/console.c

@@ -18,7 +18,6 @@ static uint8_t cursor_col;
  * store in order. */
 static volatile uint16_t *const vga = (uint16_t *)VGA_ADDR;
 
-/* Move every line one row up and blank the last line */
 static void scroll(void)
 {
     for (uint8_t row = 1; row < VGA_HEIGHT; row++) {

kernel/arch/x86_64/keyboard.c

@@ -89,8 +89,6 @@ static uint8_t k_shift;
 static uint8_t k_caps;
 static uint8_t k_e0;
 
-/* Queue helpers below; port I/O comes from io.h. */
-
 /* Drop-newest on full: keeps the consumer's prefix intact for editing. */
 static void enqueue(char c)
 {

kernel/arch/x86_64/serial.c

@@ -41,7 +41,6 @@ void serial_putchar(char c)
     /* Spin until THR is empty; hangs only if hardware is absent/wedged,
      * which is why callers gate on serial_ok() when unsure. */
     while ((inb(COM_LSR) & LSR_TX_EMPTY) == 0) {
-        /* Poll. */
     }
     outb(COM_DATA, (uint8_t)c);
 }