docs: fix broken link for download page.

a script was inserting a path that is no longer needed.
the removed class was the script identifier, so removing
this class means the path won't be added.
diff --git a/docs/html/sdk/download.jd b/docs/html/sdk/download.jd
index 76f1213..47505e6 100644
--- a/docs/html/sdk/download.jd
+++ b/docs/html/sdk/download.jd
@@ -58,7 +58,7 @@
   <h2>Thank you for downloading the Android SDK!</h2>
   <p>Your download should be underway. If not, <a id="click-download">click here to start the download</a>.</p>
   <p>To set up your Android development environment, please read the guide to
-    <a href="installing.html" class="addVersionPath">Installing the Android SDK</a>.
+    <a href="installing.html">Installing the Android SDK</a>.
     Once you have completed the installation, see the
     <a href="/guide/index.html">Dev Guide</a> for documentation about
     developing Android applications.</p>