docs: add section titles for InsertBatch

Author: kenjis

user_guide_src/source/database/query_builder.rst

@@ -878,6 +878,9 @@ insertBatch
 $builder->insertBatch()
 -----------------------
 
+Insert from Data
+^^^^^^^^^^^^^^^^
+
 Generates an insert string based on the data you supply, and runs the
 query. You can either pass an **array** or an **object** to the
 method. Here is an example using an array:
@@ -890,6 +893,9 @@ The first parameter is an associative array of values.
 
 .. warning:: When you use ``RawSql``, you MUST escape the data manually. Failure to do so could result in SQL injections.
 
+Insert from a Query
+^^^^^^^^^^^^^^^^^^^
+
 You can also insert from a query:
 
 .. literalinclude:: query_builder/117.php