[DOC] Fix markdown level for intl teach notebook #476

[jk3587]

PR Description

Please describe the changes proposed in the pull request:

• Fixes [DOC] International Teacher Data notebook should not have 1st-level markdown beyond title #476
• Move down the header Data Dictionary down one level

This PR resolves #476.

PR Checklist

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Documentation Changes

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Relevant Reviewers

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• @ericmjl

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[codecov]

Codecov Report

Merging #523 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #523   +/-   ##
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  Coverage   92.92%   92.92%           
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  Files          10       10           
  Lines         891      891           
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  Hits          828      828           
  Misses         63       63

[ericmjl]

Thank you, @jk3587! Going to hit the big green button! 😄