Fix docstring for generate_data_clusters

[RealDream21]

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I have stumbled across this while trying to use this function. The only thing I changed is the docstring to match the expected output ( in the line before the return there is a comment talking about the output but is different from what the docstring is saying).

[yzhao062]

Thanks for the fix. The docstring reorder is correct: generate_data_clusters returns train_test_split(X, y, ...), which yields (X_train, X_test, y_train, y_test), and the current Returns block has the wrong order.

Before I can merge, this PR needs to be rebased. The branch was opened off 3070497 (before commits d07f9c7 and bfbb3a6 landed), and as a result it lacks about 200 lines of code that the time-series detectors (generate_ts_data) and graph utilities (generate_graph_data) added in the meantime. The branch's copy of pyod/utils/data.py predates those additions, and GitHub currently reports the PR as conflicting. Rebasing avoids a conflict resolution that could accidentally drop generate_ts_data and generate_graph_data.

Could you rebase on the latest target branch (yzhao062/pyod:master, often upstream/master locally) and force-push? If this should land through development instead, please retarget the PR to development and rebase on yzhao062/pyod:development. After that I can rerun the review/checks and merge if everything is clean.

If you would rather not rebase, just let me know and I will land the docstring fix as a small cherry-pick with co-author credit so it is preserved.

Either way, thanks again for catching the mismatch.