Fix "JSON Lines" markdown

[jkroll-aws]

Issue #, if available: n/a

Description of changes: Change all occurrences of JSONLines to JSON Lines. See https://jsonlines.org/.

Testing done: n/a, markdown-only change.

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[jkroll-aws]

Closing in favor of 6 PRs that each change 1 notebook for the sake of modularizing and debugging CI.