docs: fix spelling in spending glossary

[00200200]

Summary

Fix the two occurrences of Transporation in the USAspending sandbox tutorial glossary. The glossary is used by the text-to-SQL example as reference material, so the agency name should be spelled Transportation.

Test plan

• git diff --check
• Confirmed no Transporation occurrences remain in the glossary.

This is an editorial-only example-data change; no runtime behavior is affected.

Issue number

N/A

Checks

• I've added new tests, if relevant
• I've run .agents/skills/code-change-verification/scripts/run.sh (not applicable: editorial-only example data)
• I've confirmed all applicable verification steps pass
• If using Codex, I've run /review before submitting this PR