Fix demonstration of how to trace SQL statements in docs

The old way shown causes a build error in swift 3 (XCode8): Ambiguous reference to member 'print(_:separator:terminator:)'
stephencelis · Jun 16, 2017 · f24bc5d · f24bc5d
1 parent 92db670
commit f24bc5d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/Documentation/Index.md b/Documentation/Index.md
@@ -1578,7 +1578,7 @@ We can log SQL using the database’s `trace` function.
 
 ``` swift
 #if DEBUG
-    db.trace(print)
+    db.trace { print($0) }
 #endif
 ```