Fixes available options for mode in the hamming loss function.

[arefrazavi]

Description

Brief Description of the PR:

Fixes available options for mode in the hamming loss function docstring.

Type of change

• [ ] Bug fix
• [ ] New Tutorial
• [x] Updated or additional documentation
• [ ] Additional Testing
• [ ] New Activation and the changes conform to the activation contribution guidelines
• [ ] New Callback and the changes conform to the callback contribution guidelines
• [ ] New Image addition and the changes conform to the image op contribution guidelines
• [ ] New Layer and the changes conform to the layer contribution guidelines
• [ ] New Loss and the changes conform to the loss contribution guidelines
• [ ] New Metric and the changes conform to the metric contribution guidelines
• [ ] New Optimizer and the changes conform to the optimizer contribution guidelines
• [ ] New RNN Cell and the changes conform to the rnn contribution guidelines
• [ ] New Seq2seq addition and the changes conform to the seq2seq contribution guidelines
• [ ] New Text addition and the changes conform to the text op contribution guidelines

Checklist:

• [x] I've properly formatted my code according to the guidelines
  • [x] By running Black + Flake8
  • [ ] By running pre-commit hooks
• [ ] This PR addresses an already submitted issue for TensorFlow Addons
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] This PR contains modifications to C++ custom-ops

How Has This Been Tested?

If you're adding a bugfix or new feature please describe the tests that you ran to verify your changes:

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[bot-of-gabrieldemarmiesse]

@ssaishruthi

You are owner of some files modified in this pull request. Would you kindly review the changes whenever you have the time to? Thank you very much.

[arefrazavi]

Hey @SSaishruthi.

There is an error on the checks unrelated to the PR change.

ImportError: cannot import name 'Config' from 'pytest'

It might be related to having init.py in the tests folder: https://stackoverflow.com/questions/41748464/pytest-cannot-import-module-while-python-can

Do you confirm?