message: Add instruction to auto format python files
diff: @@ -141,6 +141,11 @@ Check lint with Black or Pyupgrade for an individual python file could be done w
  bazel run //tools/lint:check -- black pyupgrade -- tensorflow_io/core/python/ops/version_ops.py
  ```
  +Format individual python file with black and pyupgrade could be done with:
  +```
  +bazel run //tools/lint:lint -- black pyupgrade -- tensorflow_io/core/python/ops/version_ops.py
  +```
  +
  ### Python
  