[Fix link to autoconf tarball.
Eric Kow <kowey@darcs.net>**20090723135420
 Ignore-this: cfe87256fbd5af286a00fbb84ca443d0
] hunk ./doc/index.html 77
-      <ul><li>deprecated <a href="releases/darcs-2.3.0.tar_autoconf.gz">autoconf version</a></li></ul>
+      <ul><li>deprecated <a href="releases/darcs-2.3.0_autoconf.tar.gz">autoconf version</a></li></ul>