[pushpanjalich1985]

Correct the noise covariance notation in the LQ and LQMarkov class docstrings.

The documented expression is corrected from E[w_t' w_t] = I to E[w_t w_t'] = I to match the stated dimensions of the noise vector and identity matrix.

This is a documentation-only change.

Assisted-by: ChatGPT (GPT-6)

[github-actions]

Thanks for the pull request, @pushpanjalich1985!

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[pushpanjalich1985]

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