fixup! add comment

Author: avivkeller

test/parallel/test-fs-glob.mjs

@@ -339,6 +339,8 @@ describe('fsPromises glob', function() {
 });
 
 const normalizeDirent = (dirent) => relative(fixtureDir, join(dirent.parentPath, dirent.name));
+// The call to `join()` with only one argument is important, as
+// it ensures that the proper path seperators are applied.
 const normalizePath = (path) => (isAbsolute(path) ? relative(fixtureDir, path) : join(path));
 
 describe('glob - withFileTypes', function() {