Typo fixes in comments and variable names.

term/gfxterm.c

@@ -349,7 +349,7 @@ grub_gfxterm_init (void)
           
           /* Try out video mode.  */
           
-          /* If we have 8 or less bits, then assuem that it is indexed color mode.  */
+          /* If we have 8 or less bits, then assume that it is indexed color mode.  */
           if ((depth <= 8) && (depth != -1))
             flags |= GRUB_VIDEO_MODE_TYPE_INDEX_COLOR;
 
@@ -399,7 +399,7 @@ grub_gfxterm_init (void)
     {
       /* No gfxmode variable set, use defaults.  */
       
-      /* If we have 8 or less bits, then assuem that it is indexed color mode.  */
+      /* If we have 8 or less bits, then assume that it is indexed color mode.  */
       if ((depth <= 8) && (depth != -1))
         flags |= GRUB_VIDEO_MODE_TYPE_INDEX_COLOR;
 

term/i386/pc/serial.c

@@ -88,7 +88,7 @@ serial_hw_fetch (void)
   return -1;
 }
 
-/* Put a chararacter.  */
+/* Put a character.  */
 static void
 serial_hw_put (const int c)
 {
@@ -273,7 +273,7 @@ serial_hw_init (void)
 {
   unsigned char status = 0;
 
-  /* Turn off the interupt.  */
+  /* Turn off the interrupt.  */
   grub_outb (0, serial_settings.port + UART_IER);
 
   /* Set DLAB.  */

term/i386/pc/vesafb.c

@@ -54,7 +54,7 @@ struct grub_colored_char
 
 struct grub_virtual_screen
 {
-  /* Dimensions of the virual screen.  */
+  /* Dimensions of the virtual screen.  */
   grub_uint32_t width;
   grub_uint32_t height;
 
@@ -77,7 +77,7 @@ struct grub_virtual_screen
   grub_uint8_t fg_color;
   grub_uint8_t bg_color;
 
-  /* Text buffer for virual screen. Contains (columns * rows) number
+  /* Text buffer for virtual screen. Contains (columns * rows) number
      of entries.  */
   struct grub_colored_char *text_buffer;
 };
@@ -376,7 +376,7 @@ scroll_up (void)
       virtual_screen.text_buffer[i].index = 0;
     }
 
-  /* Scroll frambuffer with one line to up.  */
+  /* Scroll framebuffer with one line to up.  */
   grub_memmove (framebuffer,
                 framebuffer
                 + bytes_per_scan_line * virtual_screen.char_height,