Typo fixes in comments and variable names.

video/i386/pc/vbe.c

@@ -606,7 +606,7 @@ grub_video_vbe_set_viewport (unsigned int x, unsigned int y,
                              unsigned int width, unsigned int height)
 {
   /* Make sure viewport is withing screen dimensions.  If viewport was set
-     to be out of the reqion, mark its size as zero.  */
+     to be out of the region, mark its size as zero.  */
   if (x > active_mode_info.x_resolution)
     {
       x = 0;
@@ -766,7 +766,7 @@ grub_video_vbe_unmap_color (struct grub_video_i386_vbeblit_info * source,
   if ((mode_info->mode_type 
        & GRUB_VIDEO_MODE_TYPE_INDEX_COLOR) != 0)
     {
-      /* If we have out of bounds color, return trasnparent black.  */
+      /* If we have an out-of-bounds color, return transparent black.  */
       if (color > 255)
         {
           *red = 0;
@@ -958,7 +958,7 @@ grub_video_vbe_blit_glyph (struct grub_font_glyph * glyph,
   return GRUB_ERR_NONE;
 }
 
-/* NOTE: This function assumes that given coordiantes are within bounds of 
+/* NOTE: This function assumes that given coordinates are within bounds of 
    handled data.  */
 static void
 common_blitter (struct grub_video_i386_vbeblit_info *target,
@@ -1435,7 +1435,7 @@ grub_video_vbe_create_render_target (struct grub_video_render_target **result,
   target->mode_info.bpp = 32;
   target->mode_info.bytes_per_pixel = 4;
   target->mode_info.pitch = target->mode_info.bytes_per_pixel * width;
-  target->mode_info.number_of_colors = 256; /* Emulated paletted.  */
+  target->mode_info.number_of_colors = 256; /* Emulated palette.  */
   target->mode_info.red_mask_size = 8;
   target->mode_info.red_field_pos = 0;
   target->mode_info.green_mask_size = 8;