docs: add sub section titles

Author: kenjis

user_guide_src/source/database/results.rst

@@ -16,20 +16,31 @@ getResult()
 ===========
 
 This method returns the query result as an array of **objects**, or
-**an empty array** on failure. Typically you'll use this in a foreach
+**an empty array** on failure.
+
+Getting an Array of stdClass
+----------------------------
+
+Typically you'll use this in a foreach
 loop, like this:
 
 .. literalinclude:: results/001.php
 
 The above method is an alias of ``getResultObject()``.
 
+Getting an Array of Array
+-------------------------
+
 You can pass in the string 'array' if you wish to get your results
 as an array of arrays:
 
 .. literalinclude:: results/002.php
 
 The above usage is an alias of ``getResultArray()``.
 
+Getting an Array of Custom Object
+---------------------------------
+
 You can also pass a string to ``getResult()`` which represents a class to
 instantiate for each result object