03-filter.md: Use a callout box for the blurb about date types

lesson-template documents this syntax at [1]. [1]: https://github.com/swcarpentry/lesson-template/blob/f73b05cc262ba7c522b43de9f6ef87eecb87b6a4/01-one.md#callout-box-callout
uzinaduzina · Mar 26, 2015 · 23ca7c1 · 23ca7c1
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commit 23ca7c1
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diff --git a/03-filter.md b/03-filter.md
@@ -67,6 +67,8 @@ SELECT * FROM Visited WHERE (site="DR-1") AND (dated<="1930-00-00");
 (The parentheses around the individual tests aren't strictly required,
 but they help make the query easier to read.)
 
+> ## Date types {.callout}
+>
 > Most database managers have a special data type for dates.
 > In fact, many have two:
 > one for dates,