create rule syntax

The manual shows slightly different variations for the create rule
syntax here and here:

http://www.postgresql.org/docs/8.0/static/rules-update.html
http://www.postgresql.org/docs/8.0/static/sql-createrule.html

The attached patches makes the first look like the second.  The key change
is that it shows how multiple actions are delimited:

(actions) vs. (command ; command ...)

Kris Jurka