There are several broken links in the generated jvmti.html:

grep html images/docs/specs/jvmti.html
    <a href="http://docs.oracle.com/javase/9/docs/technotes/guides/jpda/architecture.html">Java
    <a href="http://docs.oracle.com/javase/9/jni/invocation.html#getenv">
    <a href="http://docs.oracle.com/javase/9/jni/types.html#modified-utf-8-strings">
    <a href="http://docs.oracle.com/javase/9/jni/design.html">Java
    <a href="http://docs.oracle.com/javase/9/jni/functions.html#local-references">
      <a href="http://docs.oracle.com/javase/9/jni/design.html#java-exceptions">Java Exceptions</a>
<a href="http://docs.oracle.com/javase/9/jni/invocation.html#attaching-to-the-vm">Attaching to the VM</a>.
        <a href="http://docs.oracle.com/javase/9/jni/types.html#type-signatures">JNI
        <a href="http://docs.oracle.com/javase/9/jni/index.html">JNI Specification</a>
        <a href="http://docs.oracle.com/javase/9/jni/index.html">JNI Specification</a>
      See <a href="http://docs.oracle.com/javase/9/jni/functions.html">JNI
path to a <a href="http://docs.oracle.com/javase/9/docs/technotes/guides/jar/jar.html">
<a href="http://docs.oracle.com/javase/9/docs/technotes/guides/jar/jar.html">JAR file</a> to be
<a href="http://docs.oracle.com/javase/9/jni/functions.html#interface-function-table">