doc: Fix documentation of local_preload_libraries

The documentation used to suggest setting this parameter with ALTER ROLE
SET, but that never worked, so replace it with a working suggestion.

Reported-by: Kyotaro Horiguchi 

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index c7ef567e6c61761ba9e03c94756615898d58620f..ebd2729aff2008b26c2b37de3493424fd7e796c0 100644 (file)
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -5678,8 +5678,8 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
         this feature is to allow debugging or performance-measurement
         libraries to be loaded into specific sessions without an explicit
         LOAD command being given.  For example, debugging could
-        be enabled for all sessions under a given user name by setting
-        this parameter with ALTER ROLE SET.
+        be enabled for a session by setting this parameter via the
+        PGOPTIONS environment variable.