Merge pull request #43 from thp/code-fixes

Code fixes

src/chapter-31.md

@@ -37,7 +37,7 @@ the way up to 360x480—and that's with the vanilla IBM VGA!
 
 In this chapter, I'm going to focus on one of my favorite 256-color
 modes, which provides 320x400 resolution and two graphics pages and can
-be set up with very little reof the VGA. In the next chapter, I'll
+be set up with very little reprogramming of the VGA. In the next chapter, I'll
 discuss higher-resolution 256-color modes, and starting in Chapter 47,
 I'll cover the high-performance "Mode X" 256-color programming that many
 games use.
@@ -341,7 +341,7 @@ LinesDone:
 ;
      call   GetNextKey
      mov    ax,0003h
-     int    10h                    text mode
+     int    10h                    ;text mode
      mov    ah,4ch
      int    21h   ;done
 ;