Fix trigger example code to match header changes

I should have done this in b93f5a5673b4bb09e14eb80fe28aa21fc20a6271 but
didn't notice the problem at the time.

Per report from Marco Nenciarini

diff --git a/doc/src/sgml/trigger.sgml b/doc/src/sgml/trigger.sgml
index a2ee28320d7ab702208525e2a3e30ec3bfdd7e5e..f579340e48f1e66aa0b5c2723b820914ee0e7ba9 100644 (file)
--- a/doc/src/sgml/trigger.sgml
+++ b/doc/src/sgml/trigger.sgml
@@ -573,7 +573,7 @@ typedef struct TriggerData
       
        
         A pointer to a structure of type Trigger,
-        defined in utils/rel.h:
+        defined in utils/reltrigger.h:
 
 
 typedef struct Trigger
@@ -671,7 +671,8 @@ CREATE TABLE ttest (
 
 #include "postgres.h"
 #include "executor/spi.h"       /* this is what you need to work with SPI */
-#include "commands/trigger.h"   /* ... and triggers */
+#include "commands/trigger.h"   /* ... triggers ... */
+#include "utils/rel.h"          /* ... and relations */
 
 #ifdef PG_MODULE_MAGIC
 PG_MODULE_MAGIC;