MAINT: Clarification and spelling updates

[kaitj]

Updates the notebooks for some of simple / small fixes suggested in the reviews during the coding sprint. Mostly capitalization and rewording a sentence or two for clarification and to bring more inline across lessons.

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[jhlegarreta]

Test errors stem from the fact that we are using DIPY 1.3.0, and NumPY 1.24, and the latter removed all support for np.float. https://github.com/carpentries-incubator/SDC-BIDS-dMRI/actions/runs/3773484312/jobs/6414959616#step:13:102

https://numpy.org/doc/stable/release/1.24.0-notes.html#expired-deprecations

gtab not existing is a consequence of the above: https://github.com/carpentries-incubator/SDC-BIDS-dMRI/actions/runs/3773484312/jobs/6414959616#step:13:134

DIPY 1.4.1 contains the necessary fixes. Upgrading DIPY in a separate PR, then will rebase this PR.

[jhlegarreta]

Cross-referencing PR #218.

[jhlegarreta]

Python 3.9 exceeded the maximum execution time of 6 hours; Python 3.7 and 3.8 succeeded: https://github.com/carpentries-incubator/SDC-BIDS-dMRI/actions/runs/3778995767

Merging.