Change default Markdown tab size (#8080)

Following up to #8079, this PR changes the default Markdown tab size to
2 spaces.

This should produce less surprising formatting for lists when using
Prettier.

Release Notes:

- Changed default Markdown tab size to 2 spaces.
8178d347b6Marshall Bowers committed on 2/20/2024, 6:18:40 PM· committed by GitHubparent33ecb42
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