Link to Lucene Query Parser Syntax doc is broken on Search Query Syntax page

Link to 'Query Parser Syntax' on Search Query Syntax page is broken.

It looks like the lucene docs are now versioned. So we'll need to keep the link up to date.

JIRA 3.13.x is running Lucene 2.3.2, so the correct link is:
http://lucene.apache.org/java/2_3_2/queryparsersyntax.html