Use proper exception type in documentation (#557)
As the outermost exception seen by the user is actually
NoClassDefFoundError the FAQ entry should also mention this type.
diff --git a/org.jacoco.doc/docroot/doc/faq.html b/org.jacoco.doc/docroot/doc/faq.html
index 5c5275a..a1e2e2f 100644
--- a/org.jacoco.doc/docroot/doc/faq.html
+++ b/org.jacoco.doc/docroot/doc/faq.html
@@ -141,7 +141,9 @@
<code>-Xshareclasses:none</code>.
</p>
-<h3>Why do I get an error "<code>ClassNotFoundException: org.jacoco.agent[...]Offline</code>"?</h3>
+<h3>Why do I get a <code>NoClassDefFoundError</code> or
+ <code>ClassNotFoundException</code> for class
+ <code>org.jacoco.agent[...]Offline</code>?</h3>
<p>
If you use <a href="offline.html">offline instrumentation</a> the instrumented
classes get a direct dependency on the JaCoCo runtime. Therefore