Clarify aggregation challenge solution

[Joe-Heffer-Shef]

Changes

• Add a paragraph to explain the SQL query in the solution
• Use full words for the column alias, rather than a single letter

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/datacarpentry/sql-ecology-lesson/compare/md-outputs..md-outputs-PR-382

The following changes were observed in the rendered markdown documents:

 02-sql-aggregation.md | 9 +++++++--
 md5sum.txt            | 2 +-
 2 files changed, 8 insertions(+), 3 deletions(-)

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⏱️ Updated at 2025-01-24 13:04:32 +0000

[jd-foster]

Thanks for the contribution - I've added some suggestions from review.