chore: formatting

books/core/43.html

@@ -1,8 +1,7 @@
-<h1>22 GAME RULES</h1>
 <h2>DIFFICULTY LEVELS</h2>
 
 <p>
-  A Check’s Difficulty Level (DL) is a measure of how complex and risky a
+  A Check's Difficulty Level (DL) is a measure of how complex and risky a
   certain operation can be. It abstracts several elements into a single number:
 </p>
 
@@ -64,7 +63,7 @@
   </tbody>
 </table>
 
-<h3>GO WITH TEN</h3>
+<h2>GO WITH TEN</h2>
 
 <p>
   If you are the Game Master and find yourself stumped when choosing an