Fix formatting of code example for array_has_duplicates

Author: steveburnett

presto-docs/src/main/sphinx/functions/array.rst

@@ -78,10 +78,10 @@ Array Functions
 .. function:: array_has_duplicates(array(T)) -> boolean
 
     Returns a boolean: whether ``array`` has any elements that occur more than once.
-    Throws an exception if any of the elements are rows or arrays that contain nulls. 
+    Throws an exception if any of the elements are rows or arrays that contain nulls. ::
 
-    SELECT array_has_duplicates(ARRAY[1, 2, null, 1, null, 3]) -- true
-    SELECT array_has_duplicates(ARRAY[ROW(1, null), ROW(1, null)]) -- "map key cannot be null or contain nulls"
+        SELECT array_has_duplicates(ARRAY[1, 2, null, 1, null, 3]) -- true
+        SELECT array_has_duplicates(ARRAY[ROW(1, null), ROW(1, null)]) -- "map key cannot be null or contain nulls"
 
 .. function:: array_intersect(x, y) -> array