Issues with n_time_correlations.ipynb tutorial

[jmjkeeling]

There look to be two issues with the n_time_correlations.ipynb tutorial notebook:

• The json seems to have trailing commas in lists of text ouptut in some cells (e.g. end of line 232), which does not parse with current jupyter.
• Cell 1 has "from oqupy.contractions import compute_correlations_nt" but this should be "from oqupy import compute_correlations_nt"

[piperfw]

Thanks for spotting these @jmjkeeling, I've made a PR for this now and will make sure the documentation is updated with the correct import once Gerald approves that for Merge.

I can only imagine a previous version of nbformat was more forgiving RE the commas..

Feel free to use the corrected notebook on branch fix-correlations-tutorial if you didn't fix it locally.

[gefux]

Thank you, @jmjkeeling and @piperfw, for spotting and fixing this. The PR is merged now (#164) and the docs rebuild.