[Repo Assist] docs: add generalized covariate adjustment notebooks to example index

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Summary

Two example notebooks for the generalized adjustment criterion were added to the repo in PRs #1292 and #1297, but were not referenced in docs/source/example_notebooks/nb_index.rst. This makes them invisible to users browsing the documentation site.

Notebooks added to the index:

• dowhy_generalized_covariate_adjustment_example.ipynb — demonstrates identification of an adjustment set using the generalized criterion (for graphs where the backdoor criterion fails)
• dowhy_generalized_covariate_adjustment_estimation_example.ipynb — demonstrates causal effect estimation using general adjustment sets

Both are added to the Miscellaneous section alongside related notebooks (dowhy_efficient_backdoor_example, dowhy_optimize_backdoor_example).

Changes

• docs/source/example_notebooks/nb_index.rst: added grid cards and toctree entries for both notebooks

Test Status

Documentation-only change — no code modified. No tests to run. The RST references match existing .ipynb files on disk.

Closes: N/A (follow-up to #1292 and #1297)

Note

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