Fix a typo: the flag name is `test_tmpdir` not `test_tempdir`.

PiperOrigin-RevId: 354595127
Change-Id: I6273e602bcb17be26ce1cf948710c6f3688f98e2
diff --git a/absl/testing/absltest.py b/absl/testing/absltest.py
index 0b05a5c..979f71d 100644
--- a/absl/testing/absltest.py
+++ b/absl/testing/absltest.py
@@ -142,7 +142,7 @@
   # Always cleanup temp files when the test completes.
   ALWAYS = 'always'
   # Only cleanup temp file if the test passes. This allows easier inspection
-  # of tempfile contents on test failure. FLAGS.test_tempdir determines
+  # of tempfile contents on test failure. FLAGS.test_tmpdir determines
   # where tempfiles are created.
   SUCCESS = 'success'
   # Never cleanup temp files.