Add GaussAdjoint to docs

[acoh64]

PR for #866

I will update more once I implement checkpointing, SDES, and Functor/non-vector parameters

[ai-maintainer]

AI-Maintainer Review for PR - Add GaussAdjoint to docs

Title and Description 👍

The title is clear and concise

The title "Add GaussAdjoint to docs" effectively communicates the purpose of the changes. However, the description could be improved. It would be helpful to have a more detailed description that explains the motivation behind adding `GaussAdjoint` to the documentation and any other relevant information about the implementation.

Scope of Changes 👍

The changes are narrowly focused

The changes in this PR are focused on adding documentation for the `GaussAdjoint` method. The author mentions future work on checkpointing, SDES, and Functor/non-vector parameters, but these do not appear to be part of the current changes.

Testing ⚠️

Testing details are missing

The description does not mention how the author tested the changes. It would be helpful to have information about the testing approach used by the author to ensure the correctness and functionality of the added documentation for `GaussAdjoint`.

Docstrings ⚠️

Docstrings are missing for the new function

The newly added function `GaussAdjoint` does not have a docstring describing its behavior, arguments, and return values. It would be beneficial to add a docstring for this function.

Suggested Changes

• Please provide a more detailed description of the changes in the PR description.
• Please provide information about how you tested the changes.
• Please add a docstring for the GaussAdjoint function describing its behavior, arguments, and return values.

Reviewed with AI Maintainer