Fix usage of logger in stdlib docs

The documentation previously showed the old way of logging and not the
newer tracer adapter. This patch updates the example to build correctly
with pgx/v5.

Signed-off-by: Sam Whited <sam@samwhited.com>

stdlib/sql.go

@@ -31,7 +31,7 @@
 // with sql.Open.
 //
 //	connConfig, _ := pgx.ParseConfig(os.Getenv("DATABASE_URL"))
-//	connConfig.Logger = myLogger
+//	connConfig.Tracer = &tracelog.TraceLog{Logger: myLogger, LogLevel: tracelog.LogLevelInfo}
 //	connStr := stdlib.RegisterConnConfig(connConfig)
 //	db, _ := sql.Open("pgx", connStr)
 //