message: fixed typo from of to or
diff: @@ -23,7 +23,7 @@ from source.
  - [bazel](https://www.bazel.build/versions/master/docs/install.html)
  - Environment to build TensorFlow from source code
  - ([Linux of macOS](https://www.tensorflow.org/install/source)).
  + ([Linux or macOS](https://www.tensorflow.org/install/source)).
  If you don't need GPU support, then try the following:
  ```sh
  