Deprecated download page

The PAM plugin download page has link to 0.1 version of PAM
plugin which is alpha and not the current version.

The link should be removed or updated.

Otherwise, we will have bugs like lp:988187

"""

Chapter "Installing server-side plugin" contain misleading (wrong) instruction.
Should be:

  mysql> INSTALL PLUGIN auth_pam_server SONAME 'auth_pam.so';

instead:

  mysql> INSTALL PLUGIN auth_pam SONAME 'auth_pam.so';

(luckily, source code contains proper instructions)

"""

In the above, he was using the 0.1 version of plugin.

Also, the documentation/FAQ needs to be updated that if they need
to use with MySQL then they need to build it from bzr.