The following bug has been logged online:

Bug reference: 1414
Logged by: Mike Blackwell
Email address: maiku41@anet.com
PostgreSQL version: 8.0.0
Operating system: N/A
Description: DOC - pl/Perl hash tags missing
Details:

In the pl/Perl section of the 8.0.0 manual, as viewed on the postgresql.org
web site, all perl code hash tags seem to be missing. i.e.

$hashref->

displays as

$hashref->

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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match