01-select.md: Use a callout box for the blurb about import/export

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 · 622bfd5 · 622bfd5
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diff --git a/01-select.md b/01-select.md
@@ -27,6 +27,8 @@ The database manager does whatever lookups and calculations the query specifies,
 returning the results in a tabular form
 that we can then use as a starting point for further queries.
 
+> ## Changing database managers {.callout}
+>
 > Every database manager --- Oracle,
 > IBM DB2, PostgreSQL, MySQL, Microsoft Access, and SQLite --- stores
 > data in a different way,