Thread: pgsql: Update documentation to mention that autovacuum also does analyze

Log Message:
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Update documentation to mention that autovacuum also does analyze so we
don't need to recommend nightly analyzes anymore unless autovacuum is off.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        maintenance.sgml (r1.80 -> r1.81)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/maintenance.sgml?r1=1.80&r2=1.81)