fix: Format example blocks

books/core/267.html

@@ -22,7 +22,7 @@
   generally takes one day per item. Multiple characters may of course pool their
   money together to purchase the more expensive abilities.
 </p>
-<p>
+<p class="example">
   <strong>Example:</strong> T o replace a weapon's current Quality with Multi
   (<a href="/books/core/#page-269">page 269</a>), you must spend 2000 zenit. To
   replace it with Resistance, you must spend 1400 zenit.