Grammar and typos

[deven367]

This PR fixes the grammar and typos in the notebooks and rename a doc

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Changes made by this pull request:

nbs/docs/getting-started/quick_start_local.ipynb
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nbs/docs/how-to-guides/cross_validation.ipynb
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nbs/docs/how-to-guides/one_model_per_horizon.ipynb
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nbs/docs/how-to-guides/prediction_intervals.ipynb
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nbs/docs/tutorials/electricity_load_forecasting.ipynb
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nbs/docs/tutorials/electricity_peak_forecasting.ipynb
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nbs/docs/tutorials/prediction_intervals_in_forecasting_models.ipynb
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[codspeed-hq]

CodSpeed Performance Report

Merging #537 will not alter performance

_{Comparing grammar-and-typos (600dd80) with main (bae5c9d)}

Summary

✅ 12 untouched

[nasaul]

LGTM