docs: clarify that only INSERT and UPDATE triggers can mod. NEW

The point is that DELETE triggers cannot modify any values.

Reported-by: Eugen Konkov
Discussion: https://postgr.es/m/919823407.20191029175436@yandex.ru

Backpatch-through: 9.4

diff --git a/doc/src/sgml/trigger.sgml b/doc/src/sgml/trigger.sgml
index 3cf48c87ad3b6e381240eb979be36bccdd9de6ce..6cdb603a5d037bacdc946249454b36c22d983cd4 100644 (file)
--- a/doc/src/sgml/trigger.sgml
+++ b/doc/src/sgml/trigger.sgml
@@ -204,7 +204,7 @@
     used to signal that the trigger performed the necessary data
     modifications in the view.  This will cause the count of the number
     of rows affected by the command to be incremented. For
-    <command>INSERT</> and <command>UPDATE</> operations, the trigger
+    <command>INSERT</> and <command>UPDATE</> operations only, the trigger
     may modify the <varname>NEW</> row before returning it.  This will
     change the data returned by
     <command>INSERT RETURNING</> or <command>UPDATE RETURNING</>,