[School-of-data] Updated "Introducing SQL dfd

[Tim McNamara]

Hey all,

I've made a few formatting changes to an article of mine that hasn't
survived the Markdown -> reStructuredText.

The commit is here:
https://github.com/okfn/datawrangling/commit/dc3ff3de93f243cfb49132e4c6f93cb339392ba7

(To be honest, I didn't realise that I still had commit rights to that
repo. Sorry that this wasn't a pull request!)

When I get time, I will work on tutorials for the areas that Rufus has
mentioned in the issues :)
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