Add comment about why pg_dump doesn't dump the public schema comment.

src/bin/pg_dump/pg_backup_archiver.c

@@ -15,7 +15,7 @@
  *
  *
  * IDENTIFICATION
- *		$PostgreSQL: pgsql/src/bin/pg_dump/pg_backup_archiver.c,v 1.157 2008/05/04 08:32:21 adunstan Exp $
+ *		$PostgreSQL: pgsql/src/bin/pg_dump/pg_backup_archiver.c,v 1.158 2008/09/05 23:53:42 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2542,6 +2542,7 @@ _printTocEntry(ArchiveHandle *AH, TocEntry *te, RestoreOptions *ropt, bool isDat
 		if (strcmp(te->desc, "SCHEMA") == 0 &&
 			strcmp(te->tag, "public") == 0)
 			return;
+		/* The comment restore would require super-user privs, so avoid it. */
 		if (strcmp(te->desc, "COMMENT") == 0 &&
 			strcmp(te->tag, "SCHEMA public") == 0)
 			return;