May I suggest that on the documentation on the current version (now 9.3) is added a link rel=canonical
Ex:
http://www.postgresql.org/docs/9.3/static/
could have
<link rel="canonical" href="http://www.postgresql.org/docs/current/static/" />
I believe this could help google offering the current documentation as a first choice.
Right now it probably considers it as a duplicated content.
Probably not the right place to tell this, but could’t guess who to send this to.
Sorry for the noise
Antony
