Fix stdoutlog import path

Import parth `stdout/stdoutout` doesn't exist and should be
`stdout/stdoutlog`.

Signed-off-by: Mikel Olasagasti Uranga <mikel@olasagasti.info>

exporters/stdout/stdoutlog/exporter_test.go

@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package stdoutlog // import "go.opentelemetry.io/otel/exporters/stdout/stdoutout"
+package stdoutlog // import "go.opentelemetry.io/otel/exporters/stdout/stdoutlog"
 
 import (
 	"bytes"