Fix broken links to ml-stars primitive JSON files (#670)

[godarrenw]

Resolves #670.

What

Repoints the seven primitive reference pages from MLBazaar/mlstars to sintel-dev/ml-stars.

Why

MLBazaar/mlstars no longer exists, so every one of these json links 404s. The package the project actually depends on is ml-stars (setup.py:26: 'ml-stars>=0.2.1.dev0,<0.4'), which lives at sintel-dev/ml-stars — same master branch, same mlstars/primitives/ layout and same filenames, so only the owner/repo segment changes.

#670 reported this; credit to @karishmavelisetty for finding it.

How I checked

Each of the seven URLs was resolved with curl -L before and after the change:

Primitive JSON	old	new
sklearn.impute.SimpleImputer.json	404	200
statsmodels.tsa.arima_model.Arima.json	404	200
mlstars.custom.timeseries_preprocessing.rolling_window_sequences.json	404	200
keras.Sequential.LSTMTimeSeriesRegressor.json	404	200
mlstars.custom.timeseries_preprocessing.time_segments_aggregate.json	404	200
mlstars.custom.timeseries_preprocessing.intervals_to_mask.json	404	200
sklearn.preprocessing.MinMaxScaler.json	404	200

I also confirmed no MLBazaar link remains that should have been updated: the only other occurrence is the citation of the MLBazaar paper in primitives.rst:209, which is a paper title rather than a repository reference — its arXiv link and the neighbouring sintel.dev/ml-stars link both return 200, so both were left alone.

The contributing guide asks for unit tests with a PR; this one only changes URLs inside .rst documentation, so there is no code path to cover.

Disclosure: prepared with AI assistance; every URL above was verified manually.

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