Fix documentation template for CREATE TRIGGER.

By using curly braces, the template had specified that one of
"NOT DEFERRABLE", "INITIALLY IMMEDIATE", or "INITIALLY DEFERRED"
was required on any CREATE TRIGGER statement, which is not
accurate.  Change to square brackets makes that optional.

Backpatch to 9.1, where the error was introduced.

diff --git a/doc/src/sgml/ref/create_trigger.sgml b/doc/src/sgml/ref/create_trigger.sgml
index d270d66c574f259eda65826c65efcc0f4fcb20fc..29b815c802f61621237a05ee8a972b181d837d5f 100644 (file)
--- a/doc/src/sgml/ref/create_trigger.sgml
+++ b/doc/src/sgml/ref/create_trigger.sgml
@@ -24,7 +24,7 @@ PostgreSQL documentation
 CREATE [ CONSTRAINT ] TRIGGER name { BEFORE | AFTER | INSTEAD OF } { event [ OR ... ] }
     ON table_name
     [ FROM referenced_table_name ]
-    { NOT DEFERRABLE | [ DEFERRABLE ] { INITIALLY IMMEDIATE | INITIALLY DEFERRED } }
+    [ NOT DEFERRABLE | [ DEFERRABLE ] { INITIALLY IMMEDIATE | INITIALLY DEFERRED } ]
     [ FOR [ EACH ] { ROW | STATEMENT } ]
     [ WHEN ( condition ) ]
     EXECUTE PROCEDURE function_name ( arguments )