[DOC] Docstring added - TimeCNN Classifier

[KowshikB03]

What does this implement/fix?

Fixes issue #2593
A docstring has been added explicitly stating that the TimeCNN model uses Sigmoid activation and MSE as the loss function to clarify its design and prevent further attempts of optimization

Does your contribution introduce a new dependency? If yes, which one?

No

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[hadifawaz1999]

Again as we mentioned before, we do not want any change in the activation usage of TimeCNN, just a mention that sigmoid is used and not softmax, so again i ask you that the PR should only include a sentence in the docstring and no change in the TimeCNNClassifier code

[MatthewMiddlehurst]

Please fill out the template and explain your changes. The note is a bit lax, it should include why this is relevant and how someone can change it.

[KowshikB03]

@hadifawaz1999 I updated the PR now which only has the DocString changes.

@MatthewMiddlehurst I updated the PR template

[MatthewMiddlehurst]

Please add the extra detail as requested and ensure the tests do not fail. You do not need to bold any of it IMO. Make sure you look at the API page generated by readthedocs to make sure it renders correctly.