filestore: Update documentation regarding locks

Reported in #1110

pkg/filestore/filestore.go

@@ -6,6 +6,10 @@
 // `[id]` files without an extension contain the raw binary data uploaded.
 // No cleanup is performed so you may want to run a cronjob to ensure your disk
 // is not filled up with old and finished uploads.
+//
+// Related to the filestore is the package filelocker, which provides a file-based
+// locking mechanism. The use of some locking method is recommended and further
+// explained in https://tus.github.io/tusd/advanced-topics/locks/.
 package filestore
 
 import (
@@ -34,7 +38,6 @@ type FileStore struct {
 // New creates a new file based storage backend. The directory specified will
 // be used as the only storage entry. This method does not check
 // whether the path exists, use os.MkdirAll to ensure.
-// In addition, a locking mechanism is provided.
 func New(path string) FileStore {
 	return FileStore{path}
 }