Fix inconsistent formatting in documentation

org.jacoco.doc/docroot/doc/classids.html

@@ -157,7 +157,7 @@ <h3>Why can't JaCoCo simply use the class name to identify classes?</h3>
   runtime &mdash; e.g. different method ordering or additional branches &mdash;
   we would end-up with different probes. For example the probe at index
   <code>i</code> would be in method <code>a()</code> and not in method
-  <b>b()</b>. Obviously this will create random coverage results.
+  <code>b()</code>. Obviously this will create random coverage results.
 </p>
 
 <h3>Why do I get an error when I try to analyze multiple versions of the same