autovacuum_max_workers docs

The current docs for autovacuum_max_workers suggest it should be modifiable
with a reload, unless I'm reading in awfully silly ways this morning (which
isn't entirely out of the question). Anyway, in the 8.3.7 and 8.5devel
instances I've tried, autovacuum_max_workers can only be set at server start.
I propose this:

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 7c82835..26a8ddf 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -3589,8 +3589,7 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;       <para>        Specifies the
maximumnumber of autovacuum processes (other than the        autovacuum launcher) which may be running at any one time.
The default
 
-        is three.  This parameter can only be set in
-        the <filename>postgresql.conf</> file or on the server command line.
+        is three.  This parameter can only be set at server start.       </para>      </listitem>     </varlistentry>

--
Joshua Tolley / eggyknap
End Point Corporation
http://www.endpoint.com