message: Make tf_doctest_lib public.
diff: @@ -33,6 +33,10 @@ py_library(
  name = "tf_doctest_lib",
  srcs = ["tf_doctest_lib.py"],
  srcs_version = "PY3",
  + visibility = [
  + "//tensorflow:__subpackages__",
  + "//tensorflow_text/google:__pkg__",
  + ],
  deps = [
  "//third_party/py/numpy",
  ],
  